This allows the certificate to be generated for all of your domains at once, and as an additional benefit, makes managing your certificates a whole lot easier. The alternative to this would be buying one single-domain certificate for every domain you need to cover. This can get costly and is a huge pain to keep track of. Also, you can add additional domains throughout the lifecycle of this certificate, simply be reissuing it.
A lot of Multi-Domain certificates will come with an additional 2-4 domains bundled in, but any SANs needed beyond that will incur an additional cost. It’s a small price to pay for the convenience that comes with a Multi-Domain SSL Certificate, especially considering additional domains cost less than purchasing brand new individual certificates.
For example, with a Multi-Domain certificate, you can cover:
This is one of the most popular SSL/TLS options in the industry, as it makes securing and managing all of your subdomains a breeze. Rather than purchasing individual certificates for each Sub-Domain, you’re doing it all with one single certificate. Unlike Multi-Domain certs, there’s no paying for additional SANs. You just use the asterisk in the generation process and you’re good to go.
For example, with a Wildcard certificate, you can cover:
MULTI-DOMAIN WILDCARD SSL