An X509 certificate is the basis for standardization found within digital certificates. The reason organizations will use this standardization format is to allow for simplification of certificate creation processes. It also allows for different organizations to share digital certificates and not have to worry about compatibility issues. Since each organization uses the same format, they can be assured that a certificate issued to the other organization with function and perform correctly to achieve the desire results.
An X509 Certificate Is Designed to Work across Multiple Applications
Organizations which do not follow the standards created by an X509 certificate, may encounter problems with compatibility across multiple applications. Certificates using X509 standards are designed in such a way that they can be used across multiple applications. For example, you can use the same digital certificate with your email, Internet and word processing applications.