A permanent sheet detailing your coverage limits, deductibles, and premiums. It acts as your official "receipt" of purchase.
When buying a car, the following insurance documents (often called "papers") are critical:
Getting Insurance for Buying a Car on the Weekend | Allstate
The physical or digital card (often called a "pink card" in some regions) that you must keep in the vehicle at all times. How to Get Your Paperwork Ready
Summary of Insurance Requirements You generally insurance to technically own a car, but you must have it to drive it off the lot or register it. Most dealerships and all lenders require proof of insurance before finalizing a sale or allowing a test drive. Key "Papers" Needed
A temporary document issued by an agent that provides immediate, short-term proof of coverage until the full policy is issued.