CI/CD is a method to frequently deliver apps to customers by introducing automation into the stages of app development. CI stands for Continuous Integration, which automates the building and testing of code. CD stands for Continuous Deployment, which automates the release of the code to a server or cloud provider.
Once I push my code to the main branch on GitHub, a GitHub Actions workflow is triggered. It verifies that my source files (HTML, CSS, JS) are present and then automatically deploys them to GitHub Pages for the world to see.