DV Single Domain SSL Certificate secures your website, both WWW and non-WWW, for domain and folders. Example:
www.interweb.ao
www.interweb.ao/blog
The Wildcard SSL Certificate protects your domain and unlimited top-level subdomains. This type of certificate will guarantee the protection of ALL servers and names that are issued in this way:
www.webmail.interweb.ao
www.blog.interweb.ao
The Wildcard or Joker certificate, as it is also known, is required in environments with several servers or with names in their subdomains belonging to a particular application.