Unit testing and integration testing are essential components of the software development process, each serving unique yet complementary roles. Unit testing focuses on isolating and testing individual components, such as a single class or function, to ensure they function correctly without side effects, making them ideal for test-driven development. Integration testing, on the other hand, evaluates how multiple components of an application work together, addressing side effects and interactions with external systems, which is crucial for identifying defects that unit tests might miss. Both testing methods are vital for the effective implementation of CI/CD pipelines, as they automate the validation process, ensuring code changes are thoroughly tested before deployment. By combining these testing strategies, development teams can increase software reliability, maintain stability, and enhance development velocity, making automated tests a priority for maintaining robust applications.