GnuPG E-mail Encryption

I’ve recently started using GnuPG to encrypt email transmission with the aid of the new FireGPG extension to firefox which allows one to use public key encryption in gmail. The extension can be found at it’s homepage. My public key can be found here if you would like to communicate with me securely. But what is public key encryption? I’ll give a layman’s introduction here. Hopefully I’ll explain it in a way you can understand.
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