| Typical fiber latency | Under 10 ms (General industry performance benchmarks) |
| GEO satellite latency | 600+ ms round trip (Due to 22,000-mile orbital altitude) |
| Wi-Fi 6 max theoretical speed | 9.6 Gbps (802.11ax specification; real-world speeds are lower) |
| Common residential data cap | 1 TB/month (Varies widely by provider and plan tier) |
| Ethernet cable categories | Cat5e, Cat6, Cat6a, Cat8 (Higher categories support faster speeds and longer runs) |
Why ISP Jargon Feels Overwhelming
Shopping for home internet often means wading through a dense alphabet soup — DSL, Mbps, WAN, QoS — before you've even compared prices. Providers use technical shorthand that can obscure what you're actually buying. This glossary cuts through that complexity, giving you a plain-language reference for the most common terms you'll encounter on plan descriptions, router setup screens, and support pages.
For a broader look at how connection types and plan costs fit together, see our end-to-end home internet guide. If speed-specific terms like Mbps and latency need unpacking, our speed terms glossary covers those in depth.
Bandwidth
The maximum amount of data that can be transmitted over a connection in a given period, usually measured in Mbps or Gbps. Higher bandwidth generally supports more simultaneous users and activities, but real-world speeds depend on many additional factors.
Latency
The time it takes for a data packet to travel from your device to its destination and back, measured in milliseconds (ms). Low latency is especially important for video calls, online gaming, and real-time applications.
IP Address
A unique numerical label assigned to each device on a network that identifies it and enables data to be routed correctly. Your router receives a public IP from your ISP and assigns private IPs to devices inside your home.
DNS
Domain Name System — the internet's address book. It translates human-readable website names (like example.com) into the numerical IP addresses computers use to locate servers.
LAN / WAN
LAN (Local Area Network) refers to your private home network — all the devices connected to your router. WAN (Wide Area Network) refers to the broader public internet your ISP connects you to.
NAT
Network Address Translation — a router function that allows multiple devices sharing a single public IP address to each communicate with the internet, using private addresses internally.
DHCP
Dynamic Host Configuration Protocol — the process by which your router automatically assigns a local IP address to each device that joins your network, so you don't have to configure addresses manually.
Ethernet
A wired networking standard that connects devices to a router using physical cables (typically Cat5e, Cat6, or Cat6a). Wired ethernet connections are generally more stable and consistent than Wi-Fi.
Wi-Fi Standard (802.11)
The technical specifications governing wireless networking. Common versions include 802.11ac (Wi-Fi 5) and 802.11ax (Wi-Fi 6), with newer standards delivering faster speeds and better performance in congested environments.
Coaxial Cable
A type of shielded cable used to carry cable TV and broadband internet signals. Cable internet providers use coaxial infrastructure to deliver service to homes.
SSID
Service Set Identifier — the name your Wi-Fi network broadcasts so devices can find and join it. You can customize your SSID in your router's settings.
VPN
Virtual Private Network — a service that encrypts your internet traffic and routes it through a server in another location, masking your IP address and adding a layer of privacy on any connection.
Connection Technologies: From the Street to Your Home
The way internet service physically arrives at your address determines the maximum speeds and reliability you can expect. Each technology has distinct trade-offs in terms of coverage, cost infrastructure, and performance consistency.
- Fiber-optic (FTTH / FTTP): Data travels as pulses of light through glass or plastic strands. Fiber typically delivers the most symmetrical upload and download speeds and the lowest latency of any wired residential technology.
- Cable (DOCSIS): Uses the same coaxial cable infrastructure built for TV signals. Speeds are generally fast for downloads but slower for uploads, and bandwidth can be shared among nearby subscribers during peak hours.
- DSL: Runs over standard copper telephone lines. Speed depends heavily on distance from the provider's central office — the farther you are, the slower the connection.
- Fixed Wireless Access (FWA): A radio signal is transmitted from a cell tower to a receiver installed at your home. Speeds and reliability vary with terrain, distance, and local network congestion.
- Satellite: Internet delivered via orbiting satellites. Traditional GEO satellites sit roughly 22,000 miles up, producing high latency. Low Earth Orbit (LEO) satellite systems orbit much closer and offer meaningfully lower latency, though coverage and capacity continue to evolve.
To understand what each of these looks like in everyday use, our connection types explainer provides real-world performance context.
Network Hardware Terms You'll See at Setup
Once service reaches your home, a set of devices manages how data moves within your space. Knowing what each piece of hardware does helps you troubleshoot problems and evaluate upgrades intelligently.
- Modem: Translates the signal coming in from your ISP into a format your home network can use. Cable and DSL connections require a modem; fiber connections often use an ONT instead.
- ONT: The device installed by a fiber provider that converts light signals from the fiber line into an ethernet signal for your router.
- Router: Directs traffic between your internet connection and every device in your home. It assigns local IP addresses and manages your LAN.
- Gateway: A combined modem-and-router unit. Many ISPs supply these as rental equipment.
- Mesh System: Multiple router nodes placed around a home to eliminate dead zones. Nodes communicate with each other to form a single seamless network. If you're building out a connected home, the Smart Home Tech hub covers how mesh fits into broader home automation setups.
- WPA3: The current Wi-Fi security protocol standard that encrypts your wireless connection. Older WEP and WPA2 protocols are considered less secure.
Plan and Policy Terms Worth Reading Carefully
Before signing a service agreement, several policy concepts directly affect what your connection will feel like day to day — and what you'll pay over time.
- Data cap: A monthly limit on total data transferred. Exceeding it can result in overage charges or speed reductions depending on the provider's policy.
- Throttling: A deliberate reduction in your connection speed, often applied after a data cap is reached or during network congestion.
- QoS: Router settings that prioritize certain types of traffic — for example, giving video calls priority over background file downloads.
- Symmetric vs. asymmetric speeds: Symmetric means upload and download speeds are equal (common with fiber). Asymmetric means they differ — often download is much faster than upload (common with cable and DSL).
- ISP: The company that provides your internet access. Understanding how ISP practices like throttling and data caps work can prevent bill surprises — a topic explored further in common home internet myths.
Many of these same concepts appear in mobile plans. If you're comparing home and mobile options, our mobile carrier jargon guide translates the equivalent wireless terminology.