NIP07 is the browser extension spec. It lets you login to nostr apps using a browser extension like nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm

NIP46 is the remote signer spec and lets you login using a remote signer like nsec bunker or nsec.app