IT Glossary
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Plain-English explainers for the terms that come up when you're speccing IT hardware — what they mean, how they work, and when you actually need them. Written by engineers, not marketers.
Explainer
What Is a NAS? Network-Attached Storage Explained
A plain-English guide to shared network storage for offices, backup, and media — how it works, how it differs from DAS and SAN, and what to weigh before buying.
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What Is a VLAN? Virtual LAN Segmentation Explained
How logical network segmentation isolates traffic, shrinks broadcast domains, and improves security and performance on managed switches.
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What Is a Docking Station? Laptop Docks Explained
How laptop docks deliver power, video, and data over one cable — and what to verify for compatibility before you standardize on a model.
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What Is PoE (Power over Ethernet)? Standards and Wattage Explained
A plain-language guide to the 802.3af/at/bt standards, wattage tiers, powered devices, and how to size a PoE switch or injector for your deployment.
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What Is a PDU (Power Distribution Unit)? Rack Power Explained
How rack power distribution units work, the four capability tiers, form factors, and what to check before you buy.
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What Is a KVM Switch? Keyboard-Video-Mouse Switching Explained
How one keyboard, monitor, and mouse can control many computers or servers from a single console.
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What Is NVMe? Non-Volatile Memory Express Explained
How the PCIe-native storage protocol works, where it beats SATA, and what to check before you buy.
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What Is Thunderbolt? Speeds, Cables, and Docks Explained
A plain-English guide to Thunderbolt speeds, cables, docks, and USB-C compatibility for IT and procurement teams.
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What Is a PoE Switch? Power over Ethernet Switches Explained
How Power over Ethernet switches carry data and power on one cable — standards, power budgets, managed options, and what to weigh before you buy.
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What Is TAA Compliance? Trade Agreements Act Explained
A plain-language guide to the Trade Agreements Act, designated countries, and substantial transformation for federal IT and procurement buyers.
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What Is a Patch Panel? Structured Cabling Explained
How patch panels terminate structured cabling, the punch-down vs. keystone choice, and how to spec the right one for your rack.
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What Is ECC Memory? Error-Correcting Code RAM Explained
How error-correcting RAM protects data integrity in servers and workstations — and how to tell whether your platform requires it.
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What Is an SFP Transceiver? Fiber Optic Modules Explained
A plain-English guide to small form-factor pluggable optics — SFP, SFP+, SFP28 and QSFP — and how to match a module to your links.
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What Is a Managed Switch? Managed vs Unmanaged Explained
How configurable network switches work, how they differ from unmanaged switches, and when your network needs one.
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What Is a Mobile Workstation? Workstation Laptops Explained
How workstation-class laptops differ from business laptops — ISV certification, professional GPUs, ECC memory, and sustained performance for engineering and creative work.
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What Is a Rack Unit (U)? Server Rack Sizing Explained
How the 1.75-inch "U" measurement governs server, switch, and PDU sizing — and how to plan rack space without running out of height, depth, or power.
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What Is NDAA Section 889 Compliance? Covered-Equipment Ban Explained
A procurement engineer's guide to the covered-equipment ban, the prohibited manufacturers, and how Section 889 differs from TAA.
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What Is a Thin Client? Lightweight Endpoints Explained
A lightweight endpoint that runs your desktop from a central server — how it works, how it compares to a PC, and where it fits.
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What Is RAID? Redundant Array of Independent Disks Explained
How RAID levels trade redundancy, performance, and usable capacity — and what to weigh before you buy.
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What Is Zero Trust? Never Trust, Always Verify Explained
A calm, technical primer on the "never trust, always verify" security model — the CISA pillars, federal mandates, and what to evaluate before you buy.
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What Is a Firewall? Network Security Explained
How firewalls inspect traffic, the difference between stateful and next-generation models, and how to size and choose one for your environment.
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What Is a Network Transceiver? SFP, QSFP, and DAC Explained
A plain-English guide to pluggable optical and copper modules, SFP and QSFP form factors, fiber types, DACs, and switch compatibility.
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What Is a UPS (Uninterruptible Power Supply)? Explained
How battery backup keeps servers, network gear, and workstations running through outages and power disturbances — and how to size one correctly.
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What Is a Rugged Laptop? Ruggedized Laptops Explained
How ruggedized laptops survive drops, dust, water and temperature extremes — and how to spec the right level of protection.
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What Is IT Asset Disposition (ITAD)?
A plain-language guide to retiring end-of-life hardware securely — data destruction, chain of custody, certified recycling, and value recovery — for IT and procurement teams.
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What Are Configuration and Staging Services?
How pre-deployment prep gets hardware ready before it reaches your team
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What Is a Managed Service Provider (MSP)?
How outsourced, SLA-backed IT management works — what it covers, how it's priced, and when it beats break-fix.
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What Is White-Glove Delivery?
A plain-English guide to premium inside delivery for racks, displays, and sensitive hardware.
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What Is Zero-Touch Provisioning (ZTP)?
A plain-English guide to configuring network devices and endpoints automatically at scale — how it works, the main approaches, when it pays off, and what to have in place first.
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What Is Technology Lifecycle Management?
A plain-English guide to managing IT assets from planning and procurement through deployment, maintenance, refresh, and secure retirement — and why a lifecycle approach lowers cost and risk.
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What Is Depot Repair? Centralized Mail-In Hardware Repair Explained
How centralized, mail-in hardware repair works for fleets of laptops, rugged devices, and printers — the RMA process, spares pools and advance exchange, turnaround, and how it compares with on-site service.
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What Is Managed Detection and Response (MDR)?
A plain-English guide to 24/7 outsourced threat detection and response — and how it differs from an MSSP or a do-it-yourself SIEM.
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What Is FedRAMP? Federal Cloud Authorization Explained
A plain-language guide to how the US government authorizes cloud services for federal use — impact levels, the ATO process, and what it means for procurement teams.
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What Is a Bill of Materials (BOM) in IT Procurement?
How itemized part-and-quantity lists keep IT quotes accurate, compatible, and complete.
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What Is Kitting in IT Deployment?
How pre-assembled deployment kits cut errors, speed rollouts, and standardize what arrives at every site.
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What Is Imaging and Provisioning? Device Deployment Explained
A plain-English guide to how organizations turn identical hardware into ready-to-use, standardized endpoints — golden images, modern zero-touch provisioning, and why many teams image at the factory or a depot instead of in the field.
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What Is a Government Contract Vehicle?
How pre-competed agreements like GSA Schedules, SEWP, and cooperative contracts let agencies buy IT faster — and when the open market is still the right path.
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What Is DNS? The Domain Name System Explained
A plain-English guide to the internet's naming system — how domain names become IP addresses, the record types behind email and websites, and why DNS is a security control worth watching.
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What Is a Subnet? Subnetting and CIDR Explained
How dividing an IP network into smaller segments with a subnet mask shapes addressing, routing, and the security boundaries between groups of devices.
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What Is a Proxy Server? Forward and Reverse Explained
How a proxy sits between clients and servers, the difference between forward and reverse proxies, and how each is used for caching, filtering, security, and load balancing.
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What Is a TPM Chip? Trusted Platform Module Explained
A calm, technical primer on the Trusted Platform Module — the hardware root of trust behind disk encryption, secure boot, and the TPM 2.0 requirement in Windows 11.
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What Is a DMZ? Network Segmentation Explained
How a DMZ isolates public-facing servers from internal systems, the single- and dual-firewall designs, what typically lives there, and where the concept fits in modern segmented and zero-trust networks.
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What Is SAN Storage? Storage Area Networks Explained
A plain-English guide to block-level storage networks — how a SAN presents raw volumes to servers, how it differs from NAS and DAS, and when an organization needs one.
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What Is AI Inference? The Run-the-Model Phase Explained
How the run-the-model stage differs from training, and how to size inference capacity by throughput, latency, and watts per rack unit — grounded in the reality that most teams run pre-trained models rather than build their own.
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What Is CUDA? NVIDIA's Parallel-Compute Platform Explained
A plain-English guide to the software layer that turns an NVIDIA GPU into a general-purpose math engine — how it works, what CUDA cores really indicate, and how to size a GPU purchase without over-buying.
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What Is an NPU? The AI Accelerator Inside Business Laptops
A plain-English guide to the neural processing unit — the on-device inference block in modern business laptops — and what its TOPS rating actually means when you are sizing a fleet.
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What Is Edge AI? Running Inference Near the Data
A plain-language guide to running machine-learning inference at the edge — why latency, connectivity, and data sovereignty push AI out of the cloud, and how to spec the hardware for it.
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What Is an SSID? Wi-Fi Network Names and Multi-SSID Design Explained
How the Service Set Identifier names a wireless network, why enterprises map multiple SSIDs to separate VLANs for guest, staff, and IoT traffic, and why hiding an SSID is not a security control.
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What Is DHCP? The DORA Exchange and Leases Explained
How the Dynamic Host Configuration Protocol assigns addresses through the four-step DORA exchange, manages leases and renewals, delivers gateway and DNS settings, and where DHCP snooping fits in.
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What Is NAT? Network Address Translation and PAT Explained
How address translation stretches scarce IPv4 space, where NAT and PAT sit at the network edge, and why it is a routing function rather than a security control.
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What Is a MAC Address? Structure, Switching, and Security Explained
How the 48-bit hardware address is built, how switches learn it, and why MAC filtering is a convenience feature while 802.1X is the real access control.
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What Is MFA? Factors, SMS Risk, and Phishing-Resistant Auth
How MFA actually works, why not all of it stops phishing, and what separates SMS codes and push prompts from FIDO2 security keys and PIV/CAC smart cards.
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What Is SIEM? Security Information and Event Management Explained
How security teams aggregate, correlate, and retain log data for threat detection and compliance reporting — and how SIEM differs from SOAR, XDR, and MDR.
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What Is a Virtual Machine? How VMs Work and What Hardware They Need
How a guest operating system runs on virtualized CPU, memory, disk, and network — why organizations consolidate servers onto VMs, how VMs differ from containers, and what a host actually needs to run them.
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What Is a Hypervisor? Type 1 vs Type 2 Virtualization Explained
The control layer beneath every virtual machine: how Type 1 and Type 2 hypervisors schedule CPU and memory, why hardware-assisted virtualization matters, and how to spec the host underneath.
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What Is CMMC? The DoD's Three Certification Levels Explained
An educational guide to the Cybersecurity Maturity Model Certification: its three levels, what NIST SP 800-171 alignment means, who in the defense supply chain must comply, and where the phased rollout stands in mid-2026.
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What Is a Default Gateway? The Off-Subnet Router Address, Explained
The next-hop router address a host uses whenever a packet's destination sits outside its local subnet — how it fits with the IP address and subnet mask, where it lives, and how devices learn it.
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What Is a Wireless Access Point? Enterprise Wi-Fi Explained
How an enterprise AP differs from an all-in-one router, why deployments split into standalone, controller-based, and cloud-managed models, and what placement, roaming, and VLAN mapping mean for a real fleet.
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What Is a Chromebook? ChromeOS Devices Explained for Schools
How ChromeOS actually works, what it does well in a managed fleet, and the workloads it is the wrong tool for.
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What Is Chrome Education Upgrade? ChromeOS Device Management Explained
The per-device license that makes a Chromebook manageable — what it unlocks, how it differs from a user license, and what to confirm at purchase.
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What Is ChromeOS Auto Update Expiration (AUE)?
The date a Chromebook platform stops receiving Google's automatic updates — how the clock is measured, and why it belongs in the procurement decision.
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What Is Google Workspace for Education? Editions Explained
The edition ladder, the all-users rule, and how the licensing decision shapes the device order underneath it.
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What Is Microsoft 365 Education? A1, A3 and A5 Plans Explained
How the A1, A3 and A5 tiers differ in applications, device management, security and analytics — and what the plan decision means for the devices a district buys next.
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What Is Windows 11 SE — and What Its End of Support Means for Schools
Microsoft's cloud-first classroom edition of Windows, how it is managed and locked down, and what its confirmed end of support means for a district that still has SE devices in service.
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What Is E-Rate? The Schools and Libraries Program Explained
Who runs the program, how the discount matrix is calculated, what Category One and Category Two mean, and why the competitive-bidding rule sets a district's procurement calendar.
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What Is CIPA Compliance? Content Filtering Requirements for Schools
The technology protection measure, the internet safety policy, the public notice and hearing, and monitoring of minors — plus where those obligations land on network hardware.
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What Is FERPA? Student Data Privacy for District IT Teams
Education records, the school-official exception that governs vendor access, and where the obligations land on disposal, backups, logging and endpoint security.
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What Is a 1:1 Device Program? A District IT Planning Primer
What 1:1 means operationally, the four workstreams a district runs in parallel, and the questions that actually decide the platform — written for district IT and procurement.
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What Is a Charging Cart? Device Storage and Power for Classrooms
How charging carts, stations, cabinets and lockers differ — plus the bay, power and circuit questions district IT and facilities have to answer before the purchase order goes out.
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What Is an Interactive Flat Panel Display?
Touch technology, embedded compute versus the OPS slot, and the mounting, power and network prerequisites that turn a display purchase into an installation project.
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What Is a Document Camera? Classroom Visualizers Explained
The modern replacement for the overhead projector — form factors, output types, and the resolution and zoom numbers that decide whether the back row can actually read it.
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What Is an Ultra Short Throw Projector?
Throw ratio in plain terms, the classroom problems ultra short throw actually solved, and how laser light sources change the maintenance math over a room's service life.
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Federal Year-End IT Buying Before September 30, 2026
What the September 30 deadline actually requires, why September is structurally the heaviest buying month of the year, and how to back-plan an IT order so the award lands in time.
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What Is SD-WAN? Software-Defined WAN Explained
How software-defined wide-area networking steers branch traffic across broadband, cellular and private circuits — and which parts of a deployment are hardware, licensing and service.
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How to Buy Adobe ColdFusion Licenses
What actually has to be decided before a ColdFusion order can be priced — edition, licensing metric, environment count, term and support — and where each answer comes from.
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What Is an Active Optical Cable (AOC)?
The third option beside a DAC twinax and a transceiver pair — how an AOC is built, why it reaches further than copper, and where it belongs in a rack or a room.
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What Is a Blanking Panel in a Server Rack?
The cheapest thermal fix in a rack, why an empty rack unit is a hole in your airflow design, and how to work out how many panels a cabinet needs.
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What Are IEC C13, C14, C19 and C20 Connectors?
The rack power vocabulary, decoded — odd numbers, even numbers, ten amps against sixteen, and the two look-alike pairs that are not interchangeable.
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Citrix and NetScaler Licensing Explained
The five questions that decide a Citrix or NetScaler quote — entitlement, metric, capacity, term and support — and why mapping what you own to what you can now buy is the hard part.
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Windows 10 Extended Security Updates Cost
The full per-device pricing structure with its date ranges, the enrollment rule that makes waiting cost the same as acting, and the point where a refresh becomes the cheaper answer.
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