CVS Health Corp. is reportedly in talks to buy Aetna Inc. for more than $66 billion. Here’s a look at what these companies do and where they match up. What is CVS? : CVS is the second-biggest drugstore chain behind Walgreens Boots Alliance Inc., and its 9,700 locations are the most publicly visible part of the company. But the bulk of CVS’s revenue and profits come from health care, whether it is selling prescriptions at stores or through the mail, or managing drug benefits for employers and insurers.

Source: Wall Street Journal October 27, 2017 18:45 UTC