GitLab CI (Continuous Integration) is a built-in CI/CD (Continuous Integration/Continuous Deployment) platform provided by GitLab for automating software development workflows, testing, and deployment pipelines. It allows developers to define and execute automated build, test, and release processes directly within the GitLab repository, enabling seamless integration with version control, issue tracking, and collaboration tools. Readers can explore GitLab CI's features, configuration options, and integrations for automating software delivery, ensuring code quality, and accelerating time-to-market for software projects, supporting agile development practices and DevOps culture.