Answer:
If someone has broken into your car, you will want to know you have Comprehensive coverage as part of your car insurance policy. Comprehensive is also known as Comp and will pay our to repair your car. If you have this coverage you will have chosen a deductible (typically either $250, $500, or $1000). A deductible is what you will pay first, and then the car insurance will pay for the rest of the cost of repairs.
Comp will only cover what is bolted into the car though. It may also cover the glass in the car, depending on the company you have. State Farm, for example, will pay to replace any piece of broken glass in the car for free without any deductibles. Most state require the windshield be replaced free of charge if you have the Comp coverage.