Comp is for stuff like a tree hits your car, your windshield needs replacement. Collision is if you hit someone and you are at fault. It covers repairs to your vehicle. Uninsured motorist is exactly what it says someone without liability insurance hits you and they are at fault you are covered. My deductible for uninsured is 100 dollars. I have it on all my cars. In Washington with USAA it cover the coast of repair, rental, loss of use, diminished value and various other smalls items. In the case of my truck depending on the outcome. USAA will go after the guilty party if they feel they can recoup the money the paid out. Again in the case of my truck I don't think they are going to get anything out of the party who hit it. Does me no good to after them. What would I go after them for?