Regression tests are a type of software testing aimed at ensuring that recent changes or updates to a program do not negatively affect its existing functionality. These tests are crucial after modifications, such as bug fixes or new features, to confirm that the software still performs as expected. Typically, regression tests involve re-running previously completed tests to check for any unintended side effects. Automated testing tools can help streamline this process, making it easier to identify issues quickly. By regularly conducting regression tests, developers can maintain software quality and enhance user satisfaction.