What is a Wildcard SSL Certificate?
Unlike a standard SSL Certificate that is issued to a single Fully Qualified Domain Name only, e.g. www.example.com, which means it can only be used to secure the exact domain to which it has been issued, a Wildcard SSL Certificate is issued to *.example.com, where the asterisk represents all possible subdomains.
Wildcard SSL is an option available for DV and OV SSL Certificates.