GitHub Workflows are custom automated processes that can be configured in your GitHub repository. They are composed of various jobs that run in a specific order based on triggers such as commits, pull requests, or schedules. These workflows can handle tasks like running tests, building and deploying code, and even automating mundane tasks like labeling issues or creating release notes.
GitHub Actions is the underlying service that powers GitHub Workflows. It allows you to create custom software development lifecycle workflows directly in your GitHub repository. A workflow is defined by a YAML file located in the .github/workflows/ directory of your repository.