What is Wildcard SSL Certificates
Wildcard certificates work the same way as a regular SSL Certificate, allowing you to secure the connection between your website and your customer's Internet browser – with one major advantage. A single Wildcard SSL Certificate covers any and all of the sub-domains of your main domain.
Wildcard certificates secure the common name and all subdomains at the level you specify when you submit your request. Just add an asterisk (*) in the subdomain area to the left of the common name.
For example a single Wildcard certificate for *.website.com can be used to secure: