A YubiKey is a hardware security key made by Yubico, offering strong, hardware-based authentication for protecting user accounts. It is highly resistant to phishing and other remote online attacks, and can be used for multi-factor, two-factor, and passwordless logins. The key connects to devices via USB or NFC and stores unique cryptographic keys in a secure, tamper-resistant chip.
Key features include support for multiple protocols like FIDO2/WebAuthn, FIDO U2F, and one-time passwords (OTP). To use it, a person simply inserts the key and taps a button to authenticate, adding a physical layer of security. Its plug-and-play functionality and durable, waterproof design make it a convenient and robust choice for enhancing digital security.