Wildcard Subdomain
A wildcard subdomain is a method for matching requests for a non-existent subdomain, i.e. subdomains for which there is no record for.
A regular subdomain must be manually setup, otherwise the visitor will get an error saying that the page could not be found. With wildcard subdomains enabled, if a visitor types in someplace.yourdomain.com, you can make the domain resolve to a default "landing" page, or you can query a database and find out what the content for this subdomain should be.
You would most likely see this feature on a blog, where categories of the blog are the subdomains, such as cooking.yourblog.com.
Synonyms: Wildcard DNS Entry, Wildcard DNS Entry
