A cosigner is a person with a steady income and good credit who signs with you on your loan. By signing the loan, they agree to make payments on your behalf should you default or otherwise be unable to pay the car loan each month.
An ideal cosigner should also have a steady income and above-average credit. By having both of these characteristics, the lender is more at ease and you may even get a lower interest rate. However, make sure the cosigner is someone you trust and vice versa. If you fail to pay, not only will it hurt your credit score, but it will hurt that of the cosigner as well.