Depending on how your website is configured, you might want to use something other than a single-domain SSL certificate.
Wildcard SSL certificates cover all of a domain name’s subdomains. For example, you can secure *.coolexample.com, which would cover shop.coolexample.com, www.coolexample.com, and any other subdomains.
UCC SSL certificates can cover multiple subdomains, unique domain names, and websites. For example, you can secure www.coolexample.com, mail.coolexample.com, and www.awesomeexample.com.