Test Execution is the phase in the software testing process where test cases are run to verify that a system or application functions as intended. During this phase, testers execute predefined test cases, which may include manual testing or automated testing, to identify any defects or issues in the software. The results of Test Execution are documented, detailing whether each test case passed or failed. This information is crucial for developers and stakeholders, as it helps assess the quality of the software and informs decisions about further development, fixes, or releases.