Public Key Certificates are a type of digital certificate that are used to authenticate the identity of an individual or organization online. This involves the use of cryptographic keys and protocols to ensure that the certificate is legitimate and trusted. Public Key Certificate management is a specialized skill that involves the creation and management of these certificates, as well as ensuring their security and validity. It is an essential component of modern online security and is used in a wide range of applications, such as securing web transactions and securing email communication.