What is JUnit and why is it important in software testing?

JUnit is a popular Java testing framework used for unit testing. It provides a simple and efficient way to write and run automated tests for your Java code. By writing JUnit tests, developers can ensure the functionality and correctness of their code, catch bugs early in the development process, and make code refactoring easier and safer.

JUnit is important in software testing because it helps in improving code quality, identifying defects early, ensuring code reliability, and facilitating continuous integration and delivery processes. With JUnit, developers can quickly validate their code changes and ensure that new features do not break existing functionality.