The Interface, also refered to as just Interface, was the planetary communications system of early 21st century Earth. It could be accessed from consoles known as Interface terminals. Users were issued accounts on the Interface, which they then could use to access various functions. (DS9: "Past Tense, Part II", "Little Green Men")
One major component of the Interface was the ability to log onto the Net. Once online through the Interface, users were able to perform a wide range of tasks, from ordering replacement ID cards, to access to databases such as SafeTech's fingerprint database, to access to television and video broadcasts, both incoming and outgoing.
Restrictions that applied to the Interface included the government's ability (and common procedure) to cut Interface access off for outgoing broadcasts during hostage situations. Additionally, overriding such a government block constituted a violation of an owner/operator's Interface operating license.
During the Bell Riots of 2024, several hostages were taken in the Administrative Building in Sanctuary District A, where the hijackers attempted to use their access to the Interface to announce their demands, but were cut off mid-announcement. (DS9: "Past Tense, Part II")