A bill is a proposed law that is presented for debate and approval in a legislative body, such as a parliament or congress. It outlines specific regulations or changes to existing laws and must go through several stages, including discussion, amendments, and voting, before it can become law. Once a bill is approved by the legislative body, it is sent to the executive branch, often the president or governor, for final approval. If signed, the bill becomes law; if vetoed, it may still become law if the legislative body overrides the veto with a sufficient majority.