nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
DNS services by InternetTraffic, a domain monetization DNS provider.
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.
Sites who has this tag are verfied by google to use WebMaster tools