The WP REST API infrastructure was introduced in WordPress 4.4. The introduction of this infrastructure allows WordPress developers to now use WordPress as a headless CMS. A headless CMS has its frontend component (the head) stripped and removed from its backend, and what remains is a backend delivering content via an API. Some common use cases for headless CMS are as follows:
Serving data to other web applications
Developers can install the WP REST API plugin to expose endpoints for WordPress for posts, pages, media and users. Developers can also extend the WordPress core REST infrastructure to register their own endpoints for custom post types and WordPress options.
Bronson will explain and demonstrate how you can use WordPress and the WP REST API to create a website that uses React on the frontend and WordPress on the backend as a headless CMS.