What's the difference between an id:

480ba79ac0e662c5538db2e92f4b6ad1c02b46b8f7c0bf1a99ee5ed17f76954b

And a pubkey:

8bad4693e04d209ebc7d38a97aa2de605f5023a84f0c1a36436ebc6faf1b2abe

And is the sig the private key?