Since any map projection is a representation of one of those surfaces on a plane, all map projections distort. Every distinct map projection distorts in a distinct way. The study of map projections is the characterization of these distortions.
If you have the car as collateral, the loan company will take the car. The co-signer is not automatically put on the title, that would be between you and the co-signer. My father co-signed a loan when I was younger, and my name was on the title, not his.
Many private student loans require a co-signer. A co-signer is typically a parent or relative with good credit that signs the promissory note and is responsible for the student loan if the primary borrower is unable to make payments. You might need a co-signer if you have a limited (or poor) credit history and are applying for a private student loan.