Steam aauthenticator is a option of two-step

[Richardlaf]

Steam aauthenticator is a option of two-step authentication on steam. It provides additional step privacy your nicknames and passwords. If this option is enabled, Steam Aauthenticator asks you for one-time passcode every time , when you login to Steam on a unfamiliar device <a href="https://steamdesktopauthenticator.me/">your steam guard mobile authenticator</a>