"Pretty Good Privacy"

https://keys.openpgp.org/ - good to lookup by email
https://keyserver.ubuntu.com/ - good to look up by key

about pgp:
https://www.fortinet.com/resources/cyberglossary/pgp-encryption

example:
what is the key fingerprint for security@cpanel.net

Example: what email address is associated with the key
7A39A56B73D1E097D57435CFCDE2DE1DCB2077F2

https://keys.openpgp.org/vks/v1/by-fingerprint/B6709B4CC6F42077F69841919521BEDCABD94DDF