A Test Plan is a document that outlines the strategy and approach for testing a software application. It defines the scope, objectives, resources, and schedule of testing activities. The plan serves as a guide for the testing team, ensuring that all necessary tests are conducted to verify that the software meets its requirements and functions correctly. The Test Plan typically includes details such as the types of tests to be performed, the testing environment, and the roles and responsibilities of team members. It also identifies potential risks and outlines how they will be managed throughout the testing process.