When a bill is passed in identical form by both the Senate and the House, it is sent to the president for his signature. If the president signs the bill, it becomes a law. Laws are also known as Acts of Congress. Statute is another word that is used interchangeably with law.
The United States Code is a compilation of most public laws currently in force, organized by subject matter. When a law has been amended by another law, the U.S. Code reflects this change. The U.S. Code collates the original law with subsequent amendments, and it deletes language that has later been repealed or superseded.