What are the Public Key Servers?
Public Key Servers exist for the purpose of making your public key available in a common database where everybody can have access to it for the purpose of encrypting messages to you. Anyone who wants to write you a message, or to check a signature on a message from you, can get your key from the keyserver, so he doesn’t have to bother you with it. While a number of key servers exist, it is only necessary to send your key to one of them. The key server will take care of the job of sending your key to all other known servers.