Apple is known for all the great hardware it's made over the years, but one piece of software helped turned the fortune of the company around forever: iTunes.
Apple introduced iTunes, a digital jukebox of sorts, in January 2001. The program's big innovation was allowing a user to store all the songs on a computer in one place. Unlike many of Apple's products, iTunes is a free download that was originally available only for Mac OS 9, but later came to Microsoft's (MSFT - Get Report) Windows to help expand iTunes' reach.Although iTunes was launched with just the ability to store all your music in one place, it became much more. With iTunes, users can now burn CDs and purchase MP3s, albums, movies, TV shows, books, and other forms of content all straight from the platform, giving Apple access to hundreds of millions of credit cards and user accounts.