You can only log in with an nsec and the nsec is secret, so no one other than yourself would be able to log into your account without having your nsec/secret key

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The npub key is the public key, which only shows/shares someone’s profile but doesn’t let you login with it

npub (the public key) is basically your web address, nsec (the secret key) is your username and password in one

You can't send messages, but you can read them with the npub.