Web server is simply a computer program that deliver (serves) Web pages. Every Web server has an IP (Internet Protocol) address and possibly a domain name. For example, if you enter the URL http://technologythesaurus.blogspot.in/ in your browser, this sends a request to the Web server whose domain name is technologythesaurus.blogspot.in The server then fetches the hosted default page and sends it to your browser.
Any computer can be turned into a Web server by installing server software and connecting to the Internet. Two leading Web servers are Apache and Microsoft’s Internet Information Server (IIS), the most widely-installed Web server.
Though web servers can also handle data requests for other protocols not covered here, like SMTP for email, or FTP for file transfer and storage, it is their ability to respond to web page requests that is the underlying force keeping the entire World Wide Web (WWW) up and running.
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