Web server is an application that provide network access to websites and other intranet and Internet content through HTTP protocol. Simply, Webservers are computers that run websites. Webservers stay connected to the Internet 24/7, 365 days a year. Normally, a web server with consistent records of an uptime of 99.5% or better are considered reliable.
This webserver statistics survey shows the number of websites and the usage percentage of cloudflare-nginx