They're designed specifically so you can access your media anywhere (on your Mac, iPad, iPhone, or iPod Touch), no matter which device you used to purchase it. There are many benefits to using iTunes and other entertainment apps if you have more than one Apple device. You can even access your media on other Apple devices using the corresponding apps for iPad, iPhone, and iPod Touch.
OS X Mountain Lion makes all of these things fun and accessible with iTunes and other built-in tools.
This includes everything from music and videos to podcasts and academic lectures-even games that you can play online with your friends. There are so many ways to view and interact with media on your Mac.