Short, easy to understand explanation of GPG/PGP for nontechnical people?

Short, easy to understand explanation of GPG/PGP for nontechnical people? Does anyone have a link to a good, but short (1-2 paragraphs) explanation of the benefits of using GPG/PGP signing and encryption for Email focused at non-technical readers? That is, why would someone care about email being signed?
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Guest [Entry]

"Why Use PGP? -- probably fits your size.

PGP is useful for two things: 1. Privacy and Security, and 2. Authenticity.
By privacy, I mean that you can prevent people from seeing things. For example, you can encrypt an email to someone, or encrypt a file with a list of passwords.
By Authenticity, I mean that you can ensure a message was sent/written by the person you think it was, and that it wasn't modified by a third party. Of course, these two can be combined.

Would also recommend -- GnuPG FAQ Advanced Topics for a quick read

HowTo and tutorial references afterwards,

GPG Signing: Traditional vs. PGP/Mime -- good short reference
The Ubuntu documentation -- GnuPrivacyGuardHowto
GPG/PGP Basics
Gnu Privacy Guard tutorial
PGP tutorial
Secure Key Generation [DRAFT]
Quick reference Mini Tutorial -- (seem to have changed to this)

Take your pick on a comfortable read."