Who likes remembering long passwords? We certainly do not.
Your PIN is a an easy 4-digit code to access your Vault.
You and only you have access to this information. It is important to note: we do not store PINs for the sake of protecting your privacy. Which is why it's important that you save the screenshot of the PIN when prompted because it will be needed when you need to recover your vault (eg. you lose or get a new phone!).
At Caden, we love making your life easier and the PIN does just that.