PGP or Pretty Good Privacy is a powerful cryptographic product family that enables people to securely exchange messages, and to secure files, disk volumes and network connections with both privacy and strong authentication .
Privacy means that only the intended recipient of a message can read it.
By providing the ability to encrypt messages, PGP provides protection against anyone eavesdropping on the network. Even if the information is intercepted, it is completely unreadable to the snooper. In addition to secure messaging, PGP also provides secure data storage, enabling you to encrypt files stored on your computer. MIT distributes PGP Freeware without cost for personal, non-commercial use . This distribution is done in cooperation with Philip Zimmermann , the original author of PGP, Network Associates , and with RSA Security , which licenses patents and software for one of the public-key encryption technologies on which PGP utilizes.