Comprehensive insurance is insurance coverage that pays for the repair or replacement. Comprehensive car insurance typically covers third-party liabilities, damage from an accident, fire, natural calamity, theft, etc.
Zero depreciation also known as Bumper to Bumper car insurance is a car insurance policy that leaves out the depreciation factor from the coverage, thus giving you complete cover. It means that if your car gets damaged following a collision, no depreciation is subtracted from the coverage of wearing out of any body parts of the car. The insurance company will pay out the entire cost of the body part for replacement.
Third-party insurance is the basic insurance cover that takes care only of third-party damages. The recipient of the claim is not the policyholder but another person or vehicle affected by the first party's insured car.