Passwords
Random passwords and passphrases, generated in your browser with the operating system's cryptographic randomness. Nothing is sent over the network, logged, or stored.
Your password
Every selected set is guaranteed to appear at least once, so the result satisfies the usual “must contain a number” rules.
Copying puts the value on your system clipboard, where it stays until something replaces it — and may sync to your other devices if you have that turned on. Paste it somewhere safe, then copy something else.