Need somewhere to save all the passwords and security words then you are in the right place. Wallet locker is like having your wallet with a padlock on it. Your data is kept in your control and never goes into the cloud (unless you keep your back up there which is not advised).
Wallet locker was initially devised to capture a picture of the cards in your wallet so you have a secure copy of the details in case your wallet gets lost or stolen. It evolved into a secure vault for lots of your other data too.
You can decide what information you keep under what categories and you control the categories too.