GitLab CI/CD (Continuous Integration/Continuous Deployment) is a powerful solution that automates the development, testing, and deployment processes of applications. With GitLab CI/CD, developers can configure pipelines to ensure that every code change is automatically tested and securely deployed. The CI (Continuous Integration) pipeline verifies that the submitted code is valid by running automated tests on each push or merge request. If all tests pass successfully, the CD (Continuous Deployment) pipeline then takes over to deploy the application to the production environment or to a staging environment, without manual intervention.