A "Speed Test" is a tool used to measure the performance of an internet connection. It typically assesses the download and upload speeds, as well as the ping or latency. Users can run a speed test through various websites or applications, which provide results in megabits per second (Mbps). These tests help individuals and businesses determine if their internet service provider (ISP) is delivering the promised speeds. They can also identify issues with connectivity, allowing users to troubleshoot problems or decide if they need to upgrade their service. Popular speed test services include Ookla Speedtest and Fast.com.