Buying credit on iTunes is the process of adding funds to your Apple ID account, which can be used to purchase apps, music, movies, TV shows, and other content from the iTunes Store, App Store, and Apple Books. You can buy credit in various ways, including using a credit or debit card, PayPal, or an iTunes gift card.
Buying credit on iTunes is important because it allows you to purchase content from the iTunes Store, App Store, and Apple Books. This content can include apps, music, movies, TV shows, and books. You can also use credit to purchase subscriptions to Apple services such as Apple Music and iCloud storage.