Hello friends,

I want to know that What is a Web server or Crawling..?

A web server is a computer that stores websites on the Internet and delivers web pages to viewers upon request.
Crawling is the process by virtue of which the search engines gather information about websites on world wide web (new / old / updates etc.) .

Crawling is the process or reading through your webpage source by search engine spiders. They provide a cache certificate after a successful crawl.