Auto Insurance Gap Coverage

Can anyone explain the basics of what a few of these auto insurance words mean?

Bodily Injury Limits mean what? and :
Property Damage Limit
Medical Payments Limit
Uninsured/Under insured Motorist Bodily Injury
Liability Coverage means what?

Bodily Injury – this covers injuries to people in other vehicles if you’re in an accident and are at fault. For instance, if you limits are 100/300, the insurance will pay $100,000/person up to $300,000/accident.
Property Damage – covers damage to property of others if you are at fault in an accident…such as the other person’s vehicle.
Medical Payments – this is a no-fault coverage. It provides medical payments regardless of who’s at fault to other people in your vehicle.
Uninsured Motorist bodily injury – provides payments for bodily injury to yourself and other passengers in your vehicle if you are hit by an uninsured vehicle
Underinsured Bodily Injury – this kicks in if the at-fault driver doesn’t have enough insurance to cover your injuries. So, say someone else hits you and you have $50,000 of medical bills. The other driver only has $25,000 of bodily injury coverage on their policy. Underinsured motorist would kick in the other $25,000.
Liability coverage just means it covers the other people in an accident if you are at fault and provides no coverage for you or your vehicle.
Uninsured Motorist property damage – this would cover damages to your vehicle if an uninsured driver hit you.
Comprehensive – covers damages to your vehicle by anything other then collision, such as fire, animal hits, glass breakage, theft, etc. The deductible is the amount that you are responsible for paying and your insurance would pay anything over that amount.
Collision – just as it sounds, covers your vehicle if you run into another vehicle or object. Again, the deductible is the amount that you are responsible for paying before insurance kicks in.
Emergency Road Service – usually this just covers towing, but could also include, lockout, gas delivery, etc.
Rental Car Limits – if you have a covered accident, your insurance company will pay for the rental car. There is usually a per day limit up to a total amount they’ll pay. So, $30/$900 would be mean they’ll pay $30 per day for the rental car up to $900 for the total time you have it.
Customized Parts & Equipment – this would cover any non-factory add-ons that you have on your vehicle, such as that subwoofer in your trunk.
Loan/Lease Gap coverage – if your vehicle is a total loss and you owe more to the finance company then the vehicle is worth, this coverage would pay the difference.