Passkeys are a secure, password-free way to sign in using your device's built-in security features like fingerprint, face recognition, or PIN. They're more secure than passwords, provide faster sign-in, work across devices when synced with password managers, and are resistant to phishing attacks. Passkeys work on modern smartphones, tablets, computers, and can be stored in password managers like 1Password, Bitwarden, iCloud Keychain, or Google Password Manager.