Using the app, users can transfer contacts, message history, camera photos and videos, web bookmarks, Mail accounts, and calendars.
Here’s Apple’s official description of their first Android app:
Everything about iOS is designed to be easy. That includes switching to it. With just a few steps, you can migrate your content automatically and securely from your Android device with the Move to iOS app. No need to save your stuff elsewhere before switching from Android. The Move to iOS app securely transfers all kinds of content for you: