Mockito is a popular Java mocking framework used for unit testing. It allows developers to create mock objects that simulate the behavior of real objects in a controlled way. The main purposes of Mockito are:

• Isolation: Test classes in isolation by mocking their dependencies
• Control: Define specific behaviors for method calls during testing
• Verification: Verify that certain methods were called with expected parameters
• Speed: Avoid expensive operations like database calls or network requests

Mockito helps create fast, reliable, and focused unit tests by eliminating external dependencies.