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To try and bake down the complex answers, if you are basically familiar with PGP or SSH keys the concept of a Passkey is sort of in the same ballpark. But instead of using the same SSH keypair more than once, Passkeys create a new keypair for every use (website) and possibly every device (e.g. 2 phones using 1 website may create 2 sets of keypars, one on each device) - and additionally embeds the username (making it "one-click login"):
ssh-keygen ...)The client private key is stored hopefully in a secure part of the phone/laptop ("enclave" or TPM hardware module) which locks it to that device; using a portable password manager instead such as Bitwarden is attractive since the private keys are stored in BW's data (so can be synced across devices, backed up, etc.)
They use the phrase "replay" a lot to mean that sending the same password to a website is vulnerable to it being intercepted and used n+1 times (hacker); in the keypair model this doesn't happen because each "challenge" is a unique crypto math puzzle generated dynamically every use, like TOTP/2FA but "better" because there's no simple hash seed (TOTP/2FA use a constant seed saved by the client but it's not as robust crypto).