Starfleet Internal Affairs (IA) acts as the general administration department for the UFP.
IA's general duties are wide reaching. Generally, all internal issues, proposals and general administration runs through Internal Affairs, unless specific to a particular department or division.
One of the most profound ways it works with individual users is through Fleet Proposals. Allowing any member to propose an addition or change to the UFP, with optional support, in order to improve our community.
For more information, see additional links.