Passkeys are [[cryptographic keys]] and each passkey consists of two keys, a [[public key]] that's registered with the online service or app, and a [[private key]] that's stored on a device such as a smartphone or a computer.^[[What are passkeys? The life-changing magic of going passwordless | ZDNET](https://www.zdnet.com/article/passkeys-what-are-they-and-how-to-get-started/)]