GitHub Actions is a powerful automation platform integrated directly into GitHub, allowing developers to create custom workflows to automate repetitive tasks throughout their project lifecycle. With GitHub Actions, it is possible to set up Continuous Integration (CI) and Continuous Deployment (CD) pipelines, thereby automating testing and deployment processes whenever code is modified or pushed to a repository. Workflows are defined in a YAML file, where users can specify the steps to follow, such as installing dependencies, running tests, and deploying to production.