All proposed legislation, and nearly all formal actions by either of the two Houses, take the form of a bill or resolution. A bill is a legislative proposal of a general nature. A bill may propose either a public or private matter, but both are numbered in the same sequence.
Public bills are the most numerous.
Private bills are designed to affect or benefit specific individuals or groups of individuals. Together, bills account for a large majority of the total of legislative proposals of each Congress. Thus, bill number 100 in the Senate is written S. 100, and in the House, H.R. 100. All concurrent resolutions, including corrective resolutions, must be agreed to in both the Senate and House. One House may seek to correct a measure it passed, or both Houses may wish to correct a measure awaiting the President's signature.