PGP means 'Pretty Good Privacy' and it is just that... pretty good privacy.
PGP is used for signing, encrypting, and decrypting texts, e-mails, files, directories, and whole disk partitions and to increase the security of e-mail communications.
There are many secure chat apps, but to send an email, and ensure the information within the body (including attachments) are private and secure, using PGP is an encrypted solution.
Basically when you generate a PGP you get two keys: a private and a public key. You never share your private key with anyone, it unlocks. You ONLY share your public key with others. For someone to send you an encrypted message, they lock the message with your public key, send it to you, which only you can open with your private key.
How to get PGP: https://gnupg.org/
More about PGP: http://www.wisegeek.com/what-is-pgp.htm
More privacy tools: https://securityinabox.org/en/
Public database of PGP Public Keys (MIT): https://keybase.io/
Activism.Media PGP Fingerprint: 8c0f69a999e6bb5e90e1765985ff852e080ff436
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