Apache Bench is a command-line tool used for benchmarking the performance of web servers. It is part of the Apache HTTP Server project and allows users to test how many requests a server can handle per second. By simulating multiple users accessing a website simultaneously, it helps identify potential bottlenecks and performance issues. The tool is simple to use, requiring just a few parameters to specify the target URL and the number of requests to send. Results include response times and the number of successful requests, making it a valuable resource for developers and system administrators looking to optimize their web applications.