How is Google Adwords different from Google Analytics?

Ans. This is one of the most common Google Adwords interview questions.

Google AdwordsGoogle Analytics
Tracks clicks even when the same person clicks the ad multiple timesTracks visits but the separate views of an ad by the same person is recorded as one visit. 
When a visitor clicks on an ad but hits the stop button, Google Adwords still counts it as a click. In the same scenario, Google Analytics will not count it as a visit.