what is the difference of Pretty Good Privacy and Gnu Privacy Guard i want to know about the difference. of this two. because as far as i know  many cryptocurrency users.  use this for  more secure  transactions specially when the amount is huge.. to prevent identity while having a discussion about the transaction.
Both PGP and GPG are software implementations of the OpenPGP protocol. Typically when people say "PGP" they refer to the OpenPGP protocol.

OpenPGP itself specifies the formats for messages and keys. Both the PGP software and GPG are implementations which produce OpenPGP messages and keys.