Continuous Integration (CI) is best used in software development scenarios where code quality, speed, and collaboration are critical. One of the primary use cases is frequent code integration in agile and DevOps environments, where multiple developers commit code daily and automated builds help detect issues early. CI is also highly effective for automated testing, ensuring that unit, integration, and regression tests run consistently with every code change. Another key use case is managing large or complex codebases, where CI helps prevent integration conflicts and maintains stability across modules. CI is widely used in microservices architectures to validate independent service updates without impacting the entire system. Additionally, CI supports faster release cycles by enabling continuous feedback, improving developer productivity, reducing manual errors, and ensuring reliable, repeatable software builds across environments.