Whether you’re registering for a new vehicle, renewing your license, in a car accident or get pulled over, you may have to provide proof of insurance. Here's what it is and why you need it.

Fake proof of insurance. This should go without saying, but you should not try to obtain or use fake proof of insurance. If you don't have insurance or some other proof of financial responsibility, ...

Proof also refers to the amount of alcohol present, and in the U.S., it's calculated by doubling the ABV. So, if a spirit is 40% ABV, it's 80 proof.