What is a PGP key?
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PGP is a collection of different cryptography technologies that can provide a number of functions.
One of these is known as public key cryptography, which is a form of asymmetric cryptography where the key you use to encrypt something is different than the key used to decrypt it. So there are, in fact, *two* PGP keys: the public key (which you share and can be used to let other people send encrypted messages to you) and the private key (which you don’t share and is used to decrypt messages sent to you). They can also be used in the reverse fashion to provide digital signatures to prove something was sent by you.
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