A typical question regarding car insurance is whether it follows the car or the driver. In most cases, your insurance policy is specific to your vehicle, and you will need insurance for each car you drive.
If someone borrows your car, your insurance will cover them as long as you gave them permission to drive the car. If you drive someone else’s car, their insurance policy should cover you.
There are some exceptions, like when you travel and rent a car. Many private insurance policies cover car rentals, but call your insurer before you rent a car to find out if it’s something available to you and, if so, what the coverage limits are.