A stub interface simulates an actual object by having a small number of methods. It's a type of object that has pre-existing data and always returns the same value regardless of the input. Furthermore, we mostly employ it when we don't want the real object to respond.
The mock is an interface that we programme to compare the outputs from the tests to the expected outcomes. We frequently use third-party libraries such as Mockito and JMock to accomplish this. It's particularly useful when we're working with a large test suite and each test demands a different set of data.
Stubs offer input for the application under test, allowing the test to be run on something other than the application under test.
Mocks provide information to the test that helps it determine whether it should pass or fail.
A stub is for the application, while a mock is for the test
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