Bandwidth testing is the process of measuring the maximum data transfer rate of a network connection. This helps determine how much data can be sent or received over a specific period, usually expressed in megabits per second (Mbps). By conducting these tests, users can identify potential issues affecting their internet speed and overall performance. During bandwidth testing, various tools and software can be used to simulate data transfers. These tests can reveal the actual speed compared to what an internet service provider (ISP) advertises. Understanding bandwidth helps users optimize their network for better performance and reliability.