> I'm old. What's the difference between a pass word and a pass key ?
Password: You have to choose a good one using your brain or a password manager of your choice, and you have to remember it using your brain or a password manager of your choice.
Passkey: Your device generates it for you, whether or not it is sufficiently random, and long enough is not up to you. You don't even have to worry about it. Your device stores it for you. You don't have to remember it in your brain, you don't have a choice if you want to use a password manager or not. The passkey is stored in something which is functionally equivalent to a password manager.
> how exactly is "this button" authenticated ?
What are you asking? How is it authenticated between the server and the client? Or how is it authenticated that the person pressing the button is the right person on the client side?
Password: You have to choose a good one using your brain or a password manager of your choice, and you have to remember it using your brain or a password manager of your choice.
Passkey: Your device generates it for you, whether or not it is sufficiently random, and long enough is not up to you. You don't even have to worry about it. Your device stores it for you. You don't have to remember it in your brain, you don't have a choice if you want to use a password manager or not. The passkey is stored in something which is functionally equivalent to a password manager.
> how exactly is "this button" authenticated ?
What are you asking? How is it authenticated between the server and the client? Or how is it authenticated that the person pressing the button is the right person on the client side?