GitHub Pages is a free service provided by GitHub that allows users to host websites directly from their repositories. It is commonly used for personal, project, or organizational websites and supports static content, which means it can serve HTML, CSS, and JavaScript files without needing a server-side language. Users can create a website by simply pushing their code to a specific branch in their GitHub repository. GitHub Pages automatically generates a live site that can be accessed via a unique URL. This makes it easy for developers and non-developers alike to showcase their work online.