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Web Browser : A user agent used to display web pages. Examples: Mozilla Firefox, Google Chrome or Internet Explorer. Wikipedia

User Agent : Software capable of communicating with a web server. Example: a web browser or cURL.

Web server : Software serving web pages (or, by extension, the hardware server hosting it). Wikipedia

Wildcard Certificate : Certificates valid for subdomains one level deep. For instance, a certificate containing a SAN for * is valid for and but not for or A wildcard is indicated by an asterisk character (*) in place of a subdomain. GreatWall provides Wildcard certificates as of March 2018. Wikipedia