steve jobs eric schmidt fighting boxing

After enjoying one of the coziest relationships in the Valley for years, Apple and Google are increasingly rivals.

The two companies are fighting across all divisions, but the battle is most intense in the mobile arena.

Apple is the iPhone company. The iPhone now generates more revenue than any other part of the business. It's also paving the way for the iPad, which Apple hopes will be its next big business.

In Steve Jobs' mind, Google wants to "kill the iPhone." Which essentially means, Steve Jobs thinks Google wants to kill Apple. (Though the companies are still partners in other areas, like search and maps.)

To keep on top, Apple's executives will have to make sure its product remains sharp. And it will move into new industries where Google operates -- like mobile advertising.

Click here to see the executives responsible for leading Apple against Google's charge →