Media types, also called MIME types, specify how the body of an HTTP message is formatted and determine how the body is serialized and deserialized. Web API has built-in support for XML, JSON, BSON, and form-url-encoded data. In this session, Tony demonstrates how to add support for additional media types by writing media formatters. He also shows how to control parameter binding by creating custom model binders, and how to perform model validation using data annotations and action filters.