Basically, collision coverage covers damages after your car crashes into something - such as a car or stationary object. Comprehensive (also known as OTC) coverage is everything else: Mother Nature, and acts of God, to thefts and vandalism (more info). Comprehensive and collision get bundled together, and pay for repairs or replacements up to the car’s current cash value (car's market value - salvage value).
Everquote also provided checkboxes to opt out of receiving calls and emails from agents. However, under the “Show My Quotes” button, the usual legal boilerplate informed me that by clicking the above button I was providing express written consent to be contacted by Everquote and a whole laundry list of insurance companies and partners, whether or not my phone number was on the Do Not Call list.