What Is Public Key Cryptography?

Public key cryptography means, instead of making one key, i make two keys. And only i know my private key, but i can give away to the world my public key. This is where you start to get to a much more of what you hear to day in pod casting. It's probably a little too difficult to explain the underlying algaritms of public key cryptography and the kind of how prime numbers are used as a part of this a. I feel like that get really confusing over pod casting.