This document discusses Joomla's REST API. It begins by defining REST and how it allows machines to interact with data over HTTP using operations like POST, GET, PUT, and DELETE. Examples are given of real-world applications that use Joomla's REST API like news apps, sales reports apps, and a desktop app for a large company. The document also discusses how the REST API can be used for features like content synchronization, preventative maintenance systems, and cross-device experiences. It acknowledges some current limitations and outlines next steps to further improve Joomla's REST API functionality.