Originally enacted in 1966, the Freedom of Information Act (FOIA) establishes a three-part system that requires federal agencies to disclose a large swath of government information to the public. First, FOIA directs agencies to publish substantive and procedural rules, along with certain other important government materials, in the Federal Register. Second, on a proactive basis, agencies must electronically disclose a separate set of information that consists of, among other things, final adjudicative opinions and certain “frequently requested” records. And lastly, FOIA requires agencies to disclose all covered records not made available pursuant to the aforementioned affirmative disclosure provisions to individuals, corporations, and others upon request.
Source: The Freedom of Information Act (FOIA): A Legal Overview