5.2 Install Applications from the App Store

     The Mac App Store is an online service that provides a wide range of Apple-approved applications for OS X. You have to pay for most of the applications, but some are free. You use the App Store application to download, install, and update applications. To use the Mac App Store, you need an Apple ID; you sign in to the store using your ID. Your Apple ID contains the payment information you use to purchase applications — for example, the credit or debit card associated with your Apple ID account. This makes the purchase process fast and convenient.