Integration Testing is a crucial phase in the software development lifecycle where individual modules are combined and tested as a group. The primary goal is to identify any issues that arise when different components interact, ensuring that they work together seamlessly. This type of testing helps to uncover interface defects and ensures that the integrated system meets specified requirements. During Integration Testing, various strategies can be employed, such as Top-Down Testing or Bottom-Up Testing. By validating the interactions between modules, developers can ensure that the overall system functions correctly, leading to a more robust and reliable software product.