Windows network monitoring glossary

Plain-language definitions of bandwidth, throughput, latency, Mbps, MB/s, network adapter and other terms used when monitoring internet speed on Windows.

Network monitoring uses a lot of similar-sounding words. This glossary explains the ones you will meet when you watch internet speed and network traffic on a Windows PC.

Speed and units

• Bandwidth: the maximum amount of data a connection can carry in a given time. Think of the width of a pipe.
• Throughput: the amount of data actually moving right now. A traffic monitor shows throughput.
• Download speed: how fast data arrives at your PC.
• Upload speed: how fast data leaves your PC. It matters for video calls, backups and sharing files.
• Mbps: megabits per second. Internet plans are usually sold in Mbps.
• MB/s: megabytes per second. Downloads and file copies often show MB/s. One byte is eight bits, so divide Mbps by eight for a rough MB/s value.
• KB/s: kilobytes per second, a thousandth of MB/s. See units explained.

Connection quality

• Latency (ping): the time a small message takes to reach a server and return, in milliseconds. Low latency matters for gaming and calls.
• Jitter: how much latency varies from moment to moment. High jitter makes calls choppy.
• Packet loss: the share of data that never arrives and has to be sent again. Even small loss can slow a connection.
• Link speed: the speed your adapter negotiated with the router. It is a ceiling, not a measure of real traffic. See Wi-Fi speed on Windows.

Windows and tools

• Network adapter: the hardware or virtual device that connects your PC to a network, such as Wi-Fi, Ethernet or a VPN. See network adapters explained.
• VPN adapter: a virtual adapter created by VPN software. Traffic through it is encrypted and routed through another server. See VPN adapters explained.
• Metered connection: a connection Windows treats as having a data limit, so it can reduce background downloads.
• Traffic monitor: a tool that shows real data sent and received, continuously. See network traffic monitor for Windows.
• Speed test: a short test that sends data on purpose to estimate the best your connection can deliver. See how to check network speed.
• Baseline: what normal looks like on your PC. Knowing your baseline makes unusual activity easy to spot.
• Bandwidth monitor: a tool that tracks how much of your connection is in use. See bandwidth monitor for Windows.

Related pages

Published 2026-10-16