A digital certificate is a series of data that identifies the identity of the parties in the Internet communication and provides a way to verify your identity on the Internet, similar to the driver's driver's license or identity card in daily life. It is issued by an authority ----- CA, also known as the Certificate Authority center, where people can use it to identify each other's identity. A digital certificate is a file that contains the public key owner information and the public key that is digitally signed by the certificate authority. The simplest certificate contains a public key, a name, and a digital signature for the certificate authority.