Binding your game to a personal account such as Facebook, Google Play, Apple or Game Center. It will save your progress and link it to your account.
Here are some benefits that you can receive from binding account.
- You can play the same game account on different devices.
- You can easily get your progress back if you lose your account (e.g. after an update),
In all of the situations above, you can easily get your old account back, if it has been bound previously.