public/private keys.... what are they?

I read http://www.weegy.com/home.aspx?ConversationId=0E113805
So, what I am guessing is that there is a public key on the computer that
is sending the information to encrypt the data and (for security) you have
another key to decrypt the data. But I suppose that the sender must have
the receivers key as well so it isn't really more secure.
:-)~MIKE~(-:
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