Code Signing Certificates are used by software developers to digitally sign applications, drivers, executables and software programs as a way for end-users to verify that the code they receive has not been altered or compromised by a third party.
It’s a technology that is used to encrypt emails. This email signing protocol uses encryption to enhance email security. S/MIME is implemented using S/MIME certificates. This technology will let you sign your emails thereby letting you verify that you are the legitimate sender of the email.