Internet Terminology: Essential Terms Explained

Shopping for internet service can feel like learning a new language. Providers throw around terms like DOCSIS 3.1, WPA3, and symmetrical gigabit without explaining what any of it means. This glossary breaks down every important internet term into plain English, organized by category so you can quickly find what you need. Bookmark this page for reference whenever you encounter unfamiliar terminology while researching internet plans or troubleshooting connection issues.

Speed and Performance Terms

Mbps (Megabits per second): The standard unit for measuring internet speed. One megabit equals one million bits of data. A 100 Mbps plan can transfer 100 million bits per second. Note the lowercase 'b' -- this is different from MBps (megabytes per second), which is 8x larger. When downloading a file, your computer typically shows the speed in MBps, so a 100 Mbps connection downloads at about 12.5 MBps.

Gbps (Gigabits per second): Equal to 1,000 Mbps. Gigabit internet plans deliver 1 Gbps or faster download speeds. This is increasingly common with fiber providers and represents the current sweet spot for future-proofing your home network.

Bandwidth: The maximum amount of data your connection can handle at once. Think of bandwidth as the diameter of a pipe -- a wider pipe allows more water (data) to flow through simultaneously. Bandwidth is shared among all devices and activities on your network.

Latency (Ping): The time it takes for data to travel from your device to a server and back, measured in milliseconds (ms). Low latency (under 20ms) is crucial for gaming, video calls, and any real-time interaction. Fiber typically offers 5-15ms, cable 15-30ms, 5G wireless 25-50ms, and traditional satellite 500-700ms. Learn more in our latency explained guide.

Jitter: The variation in latency over time. Consistent latency of 20ms is fine for gaming, but latency that fluctuates between 10ms and 100ms (high jitter) causes stuttering and lag. Fiber connections typically have the lowest jitter.

Throughput: The actual amount of data successfully transferred, as opposed to the theoretical maximum bandwidth. Your throughput is always lower than your bandwidth due to protocol overhead, network congestion, and other factors.

Packet Loss: When data packets fail to reach their destination, expressed as a percentage. Even 1-2% packet loss can noticeably degrade video calls and gaming. Packet loss can be caused by network congestion, faulty equipment, or poor signal quality.

Internet Technology Terms

Fiber Optic: Internet technology that transmits data as light pulses through thin glass or plastic strands. Fiber offers the highest speeds (up to 10+ Gbps), lowest latency, and greatest reliability of any consumer internet technology. See our guide to how fiber works.

Coaxial Cable (Coax): The copper cable used for cable internet and TV. Coax uses DOCSIS protocol to deliver internet speeds up to 10 Gbps with the latest DOCSIS 4.0 standard. Most U.S. homes have existing coax wiring.

DOCSIS (Data Over Cable Service Interface Specification): The technology standard that enables internet data over cable TV lines. DOCSIS 3.0 supports up to 1 Gbps, DOCSIS 3.1 supports up to 10 Gbps download, and DOCSIS 4.0 adds up to 6 Gbps upload capability.

DSL (Digital Subscriber Line): Internet technology using telephone copper wire. Speed degrades with distance from the provider's equipment. Being phased out in favor of fiber.

5G (Fifth Generation): The latest cellular network standard. Sub-6 GHz 5G offers moderate speed improvements over 4G LTE, while mmWave 5G delivers multi-gigabit speeds but over very short distances. Fixed wireless 5G uses these networks for home broadband.

LEO Satellite: Low Earth Orbit satellites (like Starlink's constellation) orbit at 340-550 km altitude, dramatically reducing latency compared to traditional geostationary satellites at 35,786 km. This makes LEO satellite viable for video calls and light gaming.

WiFi and Networking Terms

WiFi 6 (802.11ax): The current mainstream WiFi standard, offering faster speeds, better performance with multiple devices, and improved range compared to WiFi 5. Most new routers and devices support WiFi 6.

WiFi 6E: An extension of WiFi 6 that adds the 6 GHz frequency band, providing additional channels to reduce congestion. WiFi 6E devices experience less interference since the 6 GHz band is less crowded.

WiFi 7 (802.11be): The newest WiFi standard (2024-2026), supporting speeds up to 46 Gbps and extremely low latency. Early WiFi 7 routers and devices are becoming available, though most consumers don't need them yet.

Dual-Band / Tri-Band: Dual-band routers broadcast on 2.4 GHz (longer range, slower) and 5 GHz (shorter range, faster) frequencies. Tri-band routers add a second 5 GHz or 6 GHz band to reduce congestion with many devices.

Mesh WiFi: A system of multiple interconnected access points that blanket your home in consistent WiFi coverage, eliminating dead zones. Popular mesh systems include Eero, Google Nest WiFi, and TP-Link Deco. See our mesh WiFi guide.

SSID: Service Set Identifier -- the name of your WiFi network that appears when you search for available networks on your devices.

WPA3: The latest WiFi security protocol, providing stronger encryption than WPA2. WPA3 protects against brute-force password attacks and provides individualized data encryption. Always use WPA3 if your router and devices support it.

Equipment Terms

Modem: The device that connects your home to your ISP's network, converting their signal (cable, DSL, or fiber) into data your router can distribute. Cable modems use DOCSIS, while fiber connections use an ONT. Read our modem vs router guide for details.

Router: The device that creates your home network and distributes internet to your devices via WiFi and ethernet. Modern router features include QoS, parental controls, guest networks, and mesh compatibility.

Gateway: A combined modem-router device. ISPs often rent these all-in-one units for $10-15/month. While convenient, separate modem and router units typically offer better performance and save money long-term.

ONT (Optical Network Terminal): The device that converts fiber optic light signals into electrical signals for your home network. Required for all fiber internet connections. Usually provided and maintained by your ISP.

QoS (Quality of Service): A router feature that prioritizes certain types of traffic. You can configure QoS to prioritize video calls or gaming over bulk downloads, ensuring your most important activities get the bandwidth they need.

Plan and Billing Terms

Data Cap: A limit on how much data you can use per month. Xfinity imposes a 1.2 TB cap, while AT&T Fiber, Verizon Fios, and Spectrum have no data caps. Exceeding your cap results in overage charges or throttled speeds.

Throttling: When your ISP intentionally slows your connection, either because you've exceeded your data cap, during times of network congestion, or for specific types of traffic. A VPN can prevent some forms of traffic-based throttling.

Symmetric vs Asymmetric: Symmetric connections offer equal download and upload speeds (common with fiber). Asymmetric connections have faster download than upload speeds (common with cable and DSL).

Promotional Pricing: A lower introductory rate that lasts 12-24 months before reverting to the regular (higher) price. Always ask about the post-promotional rate when comparing plans.

ETF (Early Termination Fee): A fee charged for canceling a contract-based plan before the agreement period ends. Typically $100-400. Many providers have moved to no-contract plans with no ETF.