Wildcard SSL Certificate

A wildcard SSL certificate is aimed at securing sub-domains. For example if you own example.com then you can create subdomains such as abc.example.com def.example.com or basically anything you want preceding example.com. It could get pricey to get an SSL certificate for each sub-domain so the solution is to get a wildcard SSL Certificate. 

 There are a few rules when applying this certificate - but they are pretty obvious - the same owner needs to own all of the sub-domains and original domain. Some people like using sub-domains to keep information organized on a massive website. Or another example is using your example.com as your main website and then using sub-domains for your blog blog.example.com and your forum forum.example.com. Wildcard SSL Certificates are the way to go in this case.