An Apple ID is the email address you use as a login for many Apple services iCloud, iTunes and App store. Many users have asked if it is possible to transfer the purchases/licenses to another Apple ID. The answer is that there is no way to transfer apps or any other purchases (movies, songs, games, books etc) from one ID to another ID. Apple just does not allow it. Further you cannot merge two or more Apple IDs into a single one. However, if you are using multiple Apple IDs, you can gather all of your content purchases onto your iOS device, iPad, iPhone by copying all of your purchased content so it is on the same Mac or PC with iTunes and then sync your iOS device with after authorizing your computer to play content with each Apple ID in iTunes.