SSL Wildcard Certificates are big money-savers. An SSL Wildcard Certificate allows you to secure an unlimited number of first-level sub-domains on a single domain name. That means you can get an SSL Certificate with the common name as *.mydomain.com and you can use it on all of the following without receiving any errors:
- www.mydomain.com
- mail.mydomain.com
- intranet.mydomain.com
- secure.mydomain.com
- sitea.mydomain.com
- siteb.mydomain.com