It's something you pass around--like a word, but a key instead. If you're familiar with passwords--instead of a word--imagine a key: a passkey. That's what passkeys are. The issue with passkeys is--as you pass them around they begin to open more and more stuff; everyone is opening stuff with your key as it's passed. So they need to be sanitized every now and then. Deposit them into a furnace and buy a new passkey. Every two to three days. If you have more questions please feel free to ask!