What do you mean by Spider?

What do you mean by Spider?

In simple terms, a spider also known as “bot” is a program that visits sites and reads their pages and other data so as to make entries in the web engine index. Google bot is Google’s web spider which crawls web pages or links.

Hi Friends,
A spider is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "crawler" or a "bot." Spiders can crawl through a site's pages in several ways.

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In a simple word when you create some page and want to promote it on search engine like Google you have to submit it. After that a process start in which first it crawl(spider) and after that it will index to search engine (Google, Yahoo, Bing and Etc.). Here crawl and spider are the same term.