Assuming you live in the United States, every car must have three things: a license plate, registration, and insurance.
A license plate is a metal plate with numbers and letters that identify your car. You need a different license plate for every car you own. You can get a license plate from your local DMV office or through certain private companies.
Registration is proof that you own your car. It has your name, address, and other important information about your car. You need to renew your registration every year.
Insurance is a contract between you and an insurance company. It protects you financially if you have an accident or your car is stolen. You are required to have insurance if you drive in most states.