Search Legislation is the official website for U.S. federal legislative information. It replaces the nearly 20-year-old site with a system that includes platform mobility, comprehensive information retrieval and user-friendly presentation. The site provides access to accurate, timely, and complete legislative information for Members of Congress, legislative agencies, and the public. It is presented by the Library of Congress (LOC) using data from the Office of the Clerk of the U.S. House of Representatives, the Office of the Secretary of the Senate, the Government Publishing Office, Congressional Budget Office, and the LOC's Congressional Research Service. is usually updated the morning after a session adjourns. Consult Coverage Dates for Legislative Information for the specific update schedules and start date for each collection.

The scope of data collections and system functionality have continued to expand since THOMAS was launched in January 1995, when the 104th Congress convened. THOMAS was produced after Congressional leadership directed the Library of Congress to make federal legislative information freely available to the public.