Backup and Restore iPhones With iTunes Explained
Restore Backup restores the contents of an iPhone backup performed sometime in the past. It restores content and stored data such as app settings, home-screen layouts, etc. Saved account login information is restored if the backup was encrypted.
How to Restore your iPhone or iPad from a backup – Apple Support
https://www.youtube.com/watch?v=Jbp3gGTQygg