Profiles implements the following types of APIs:
Profiles implements the Atom Syndication Format (Atom 1.0) to serve up Atom feeds that you can use in your applications to search for and retrieve information from any of the profiles created by the people in your organization.
Profiles provides a set of feeds and Service Documents that implement the Atom Publishing Protocol. You can use these publishing APIs in your applications to interact with the Profiles application. When interacting with your own profile, you can retrieve even more detailed information about it, and you can also update it.