You can use it to put password in any application, including in your gallery or settings.
to start this app will ask the desired protection system either pattern or pin, once configured'll send you to email the password to remember. once inside the app selects those applications you want to block from prying eyes, whatsapp, facebook, gallery and anyone you want.
a system widely used is the lock whatsapp, so each time you enter your whatsapp someone with your phone must know the password or would be impossible to get into that application.
**Unofficial Product. This application is not endorsed by or affiliated with WhatsApp Inc. WhatsApp Messenger, its name, trademark, and other aspects of the app are trademarked and owned by their respective owners