Code coverage and test coverage are two metrics used in software development to ensure the quality and reliability of code. Code coverage measures the percentage of code executed during testing, while test coverage measures the extent to which tests cover the software's requirements or functionality from a user's point of view. Both are essential because they measure the quality and completeness of the testing process, but they have limitations. Code coverage is a quantitative measurement that focuses on code execution, whereas test coverage is a qualitative measurement that evaluates the quality and effectiveness of the testing process. Choosing between code coverage and test coverage depends on your specific situation, but both are critical metrics for determining software correctness.