Passwords work by asking a user and a service to share the same secret. That design creates a permanent target: the secret can be guessed, reused, stolen in a breach or captured by a convincing phishing page. Passkeys use a different model based on public-key cryptography.
When a passkey is created, the device stores a private key and the service receives a related public key. The private key is not sent to the website during login. Instead, the device proves that it possesses the key by signing a challenge. A fake website cannot simply collect the credential and replay it elsewhere.
Passkeys are usually unlocked with the same method used to unlock a device, such as a fingerprint, facial recognition or local PIN. The biometric data normally stays on the device; it is used to authorize access to the private key rather than being transmitted to every service.
The largest practical challenge is account recovery. People lose phones, replace computers and forget which account synchronized a credential. Platforms can sync passkeys across trusted devices, while some services support additional recovery methods. Each option must balance convenience against the risk that an attacker abuses the recovery process.
Organizations also need to consider shared devices, employee departures and regulated environments. A consumer-friendly synchronization system may not match the controls required by an enterprise. Device management and hardware security keys remain important for higher-risk accounts.
Passkeys are not a universal cure for account compromise, but they remove several common password failures at once. The transition will be gradual because services must support older users and devices, yet the underlying security improvement is substantial.