Passkeys are essentially credentials kept on a device, such as your phone or computer, that validates to a website or application that you are who you claim to be (though Google is still working on the passkey API for native Android apps). You authenticate yourself to the device, and it can then securely log in to sites and services you use without relying on a password that could be stolen, reused across multiple sites, or tricked into giving up to a bogus customer service agent or using on a bogus phishing site because you clicked the wrong link.
