Let's use the aftermath of Superstorm Sandy as an example to illustrate the differences between collision and comprehensive. Within that storm, let's consider two events that might have happened: 1) a heavy tree branch fell on your car, or 2) you swerved to avoid a falling tree branch and wound up crashing into a tree. In the first event, you had no control over when or why a tree branch would fall on your car. This kind of accident would get reimbursed under your comprehensive policy. In the second situation, you were driving the car and ultimately swerved into the tree, which makes it a collision, and collision insurance therefore pays for the damages. Events like the hypothetical ones stated above are why it's important to differentiate between the two types of coverage.
The above is meant as general information and as general policy descriptions to help you understand the different types of coverages. These descriptions do not refer to any specific contract of insurance and they do not modify any definitions, exclusions or any other provision expressly stated in any contracts of insurance. We encourage you to speak to your insurance representative and to read your policy contract to fully understand your coverages.