Software testing is the process of evaluating a software application or system to ensure that it functions correctly and meets the specified requirements. This process involves running various test cases to identify any bugs, defects, or errors in the software, and verifying that it behaves as expected under different conditions. Software testing helps to improve the quality, reliability, and performance of the software, and is essential for ensuring that it meets user expectations and business objectives. There are various types of software testing, such as unit testing, integration testing, system testing, and acceptance testing, each serving a specific purpose in the software development lifecycle.