The App stores your notes, todos, passwords, logins, wlan keys, bank accounts, ... whatever you wish.
The informations are structered / organized in folders, subfolders and entries.
Each of this can be protected by encrypting its informations with a 2 level encryption mechanism:
Level 0 - no password, no protection
Level 1 - low protection but fast input (pin password)
Level 2 - heavy protection but slow input (complex password)