auto insurance new driver

Proof of auto insurance – car or drive?
I was driving my cousin's car for a while. That proof of auto insurance I need to bring in the car – my car insurance card (which contains my car) or insurance card from my cousin, who shows his car – which I would be driving? It seems I am confused about what must have auto insurance – The driver or the car.
The proof that your car is insured. If your insurance covers any accident (depending on your plan includes this mine) then you should also bring a copy of your insurance card.
Young Drivers & Auto Insurance