Quote Originally Posted by James-A View Post
Wildcard SSL secures all the sub-domains along with the main domain like if a SSL is purchased for xyz.com then the sub-domain like a.xyz.com also gets secured in Wildcard while other SSL's like Domain SSL secure only a single domain. Sub-domains are not secured in this case.
Yes, I 100% agree with James. If you purchase wildcard SSL, then you will be able to use this wildcard to your another subdomain. If normal SSL, it only can use on 1 domain, ex. www.domain.com.