PGP is short for Pretty Good Privacy, it can be used to send and
receive secure messages across insecure mediums, like email. To
receive messages, you need a private key, and to send messages you
need the recipient's public key. The private key should not be
exposed anywhere, while the public key should be distributed freely.
This JavaScript-based implementation does everything within the
browser, and no server is involved for anything. This also means it
doesn't do keyserver lookups, so you'll have to do that separately.
However, self-publishing public keys should be encouraged.
SAVE YOUR PRIVATE KEY SECURELY.