What are Wildcard SSL Certificates
Wildcard SSL solutions are often a good choice for Web professionals.
If you run multiple subdomains or have multiple servers, Wildcard SSL certifcates will allow you to secure more than one server with one easy purchase, which can mean huge savings.
Wildcard SSL certificates are a good solution for ISPs, Web hosts, and large, growing organizations with multiple Web sites and servers.
However, much like hosting on a shared Web server, problems can arise with this approach. If one server or sub-domain is compromised, all sub-domains may be compromised. And if the wildcard certificate needs to be revoked, all sub-domains will need a new certificate.
Many of the leading SSL certificate providers offer Wildcard SSL certificates, such as DigiCert, Verisign, Comodo and GeoTrust.