is there a secondary password function in ipad?

After you unlock your ipad, all apps are in the clear. I want a secondary password (or "app lock") feature that requires me to enter a password to open certain specified apps. AVAST has such an app for android. Is there anything for ipad?

This would address the password reset vulnerability in email and text, if a criminal comes into possession of our device while it is unlocked, then goes to websites and resets my passwords. . I DO lock my ipad, but it's still possible for someone to grab it while it is open.