A bill is a proposed law introduced in either the U.S. House of Representatives or the U.S. Senate.
A bill originating in the House is designated by the letters “H.R.” followed by a number and bills introduced in the Senate as “S.” followed by a number. The sequential numbering of bills for each session of Congress began in the House in 1817 and in the Senate in 1847.
In 1975, Schoolhouse Rock aired an educational segment, “I’m Just a Bill,” introducing children to the concept of how a bill becomes a law.