How does a Bill become a Law?

A bill is introduced into the House of Representatives, where is it worked on by a committee (or, if additional work is needed, by a subcommittee too, which then returns it to the committee) and subsequently voted on, and approved, it is passed to the Senate, where it is voted on again. If it is approved by both, it is sent to the president, and if he (or she) signs it, it becomes a law.