Apache MyFaces is an open-source implementation of the JavaServer Faces (JSF) specification, which is a framework for building user interfaces for Java web applications. It simplifies the development of web applications by providing reusable UI components and a standard way to manage the user interface's state. MyFaces supports various features such as component libraries, AJAX support, and integration with other Java technologies. It is maintained by the Apache Software Foundation and is designed to be flexible and extensible, allowing developers to create rich web applications efficiently while adhering to the JSF standards.