Answer:
A bill is a law, but before it is approved/disapproved by the President.
Step-by-step explanation:
First, a bill has to be sent to the President for his signature. After the President signs the bill and approves of it, it becomes a law.
If a bill is not approved by the President and sent back, it is called a veto. The House of Representatives and Senate then have the power to override the veto, and if both houses agree, it becomes a law.