In unit testing, Mockito allows the creation of mock objects. These are objects that can be used in place of the real object for the purposes of testing. For example, if you are testing a method that calls another method on an external object, you can use a mock object in place of the external object. That way, you don't have to worry about the state of the external object and can focus on testing your own code.  Mockito is beneficial because it allows you to write more comprehensive unit tests. By mocking external dependencies, you can be sure that your code is working as expected regardless of the state of those dependencies. Additionally, Mockito can help to catch bugs early on in the development process. If you are using mock objects in your unit tests and a bug arises, it is likely that the bug is in your code and not in the code of the external dependency. This can save you time and effort in debugging later on. Overall, Mockito is a valuable tool for writing comprehensive and robust unit tests.