Proof of insurance is any type of official documentation that a person can provide to another which shows evidence of that the person having valid insurance with an insurance company. Such evidence, or proof of car insurance in this case, typically lists the following eight (8) key pieces of information:

1. The First Named Insured (and possibly other drivers covered)
2. The First Named Insured's address
3. The Car's year, make, model, and VIN (Vehicle Identification Number)
4. The Name of the Insurance Company
5. The Insurance Company's official NAIC or State Registration Number
6. The Policy number
7. The Policy effective date and the policy expiration date
8. Toll-free Telephone number for filing auto accident claims

The most common form of proof of insurance is a paper ID card provided by the insurance company listing policy information and effective dates as outlined above.