The Experience Composer API allows developers to capture their website's layout as a stream published to a Vonage Video API session, enabling them to create a customized experience with logos, web components, and formatted layouts. This tool is particularly useful for educational applications where sharing components such as whiteboards or slides is essential. The API can be used to start an Experience Composer, which subscribes to the user's website layout and publishes it to a Vonage Video API session, allowing it to be archived and viewed in the future. The API also provides options to stop the stream and archive, enabling developers to manage their experience composer streams effectively. By using this tool, developers can create innovative applications that capture the full experience of their websites and provide users with an enhanced experience.