When you sign up for an online account, instead of inputting a password, your login is synced via your browser profile, or more likely, an account / app on your

When you sign up for an online account, instead of inputting a password, your login is synced via your browser profile, or more likely, an account / app on your phone. To log in, you'll always either need to be signed-in on your browser, or scan a QR code on a computer to sign in to your account (WebAuthn over BLE, or cloud-assisted Bluetooth Low Energy (caBLE)).