A PGP key is a public encryption key. A PGP key can be used to sign and encrypt emails and files. When you create a PGP key, a keypair having a public key and a private key is generated. You can share the public key with anyone who wishes to send you encrypted messages or files, but the private key must be known only to you and used to decrypt received messages.
Passwords and Keys is a key management application. Though it cannot be used to encrypt or sign files and messages, you can use it to sign trustworthy keys.
To secure your communication, you can use email clients like Evolution that provide encryption and signing services.
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