GitHub Pages provides a platform for hosting websites directly from a GitHub repository. By simply editing and pushing changes to a repository, users can have their updates go live immediately. Each GitHub account and organization can host one site, with the option to create unlimited project sites. It enables users to build their own website from scratch or generate one for their project, with support for custom domains, blogging with Jekyll, and more. GitHub offers documentation and guides to help users with customizations, such as creating custom 404 pages and using submodules.