GitLab is a comprehensive open-core platform for source code management, CI/CD automation, and DevOps workflows. The platform offers both open-source community editions for self-hosting and proprietary versions with advanced enterprise features. GitLab provides Git repository hosting with sophisticated code review tools, merge request workflows, and collaborative development features for team coordination. The service includes integrated CI/CD pipelines enabling automated testing, building, and deployment of applications throughout development lifecycles. GitLab supports security scanning, vulnerability management, and compliance automation, helping organizations maintain secure codebases. The platform includes project management tools, issue tracking, and planning features that connect development work to business objectives. GitLab emphasizes DevOps practices and provides comprehensive APIs enabling integration with external tools and custom workflows.