The iTunes store has apps for iOS devices such as iPads, iPhones, and the iPod touch. The Mac App Store has apps for Mac computers running 10.6 or higher. Your Apple ID is the same for both the Mac App Store and the iTunes Store.
iPAD APPS AT THE ITUNES STORE
MAC COMPUTER APPS AT THE MAC APP STORE
Go to the MacApp store to get the applications for your Mac computer. (applications free for Macs OS 10.9 or later)
The good (or maybe bad) news is we can play Angry Birds on both an iPad and a Mac.