Almost every product Apple sells has a computer and OS X at its core. iOS is nothing more than an embedded mobile version of OS X. Apple is a computer-centric company, but the definition of what a "computer" is has changed dramatically over the last 5-10 years. Eventually desktop computers will become irrelevant for everyone except content creators. The rest can get what they need with laptops and i-things.
Why do you think Apple changed its name from Apple Computer, Inc. to simply Apple, Inc.? This company is not just about the traditional computer as you define it, but bringing technology to our lives in ways that betters our lives and continues to innovate in an industry that would not do anything new if there were no Apple.
The best part about all of it - for me anyway - is that with every new product or service offering, Apple renders Microsoft more and more irrelevant. In terms of total iOS market share (not just smart phones), it murders Android. Remember that all of the Android numbers are just for smart phones, but Apple has a total installed base of over 200 million iOS devices. That is a significant number, and something Android will spend years catching up with. That's quite a customer base for application developers.
