GitHub Actions Explained: How CI/CD Automates Code Testing and Deployment

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CI/CD stands for Continuous Integration and Continuous Deployment, an automated pipeline that tests and ships code without manual intervention. GitHub Actions is a built-in GitHub tool that triggers this pipeline whenever a repository event occurs, such as a code push or pull request. The system is structured around five core concepts: workflows, events, jobs, steps, and actions, each defining a stage in the automated process. A workflow runs on cloud-hosted machines called runners, ensuring a clean environment every time and eliminating the classic 'works on my machine' problem. The approach replaces error-prone manual deployments, where a single forgotten step can break a live application, with a consistent, repeatable automated process.

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