What is the main purpose of search engine spiders?
 

What is the main purpose of search engine spiders?

A spider is a program that visits the website and reads their pages and other information in order to boot for a search engine index.

Hi, search engine spiders crawl the websites. They read all the information of websites and provide results to search engine to provide search engine result page (serp).

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Spiders crawls links throughout the Internet, grabbing content from sites and adding it to search engine indexes. Spiders only can follow links from one page to another and from one site to another. That is the primary reason why links to your site (inbound links) are so important.

Spiders are used to feed pages to search engines. It's called a spider because it crawls over the Web

to index website and update the Google database

Search Engine Spider is to crawl the website.

I still can't find the different between Spider crawl and Robots. Are they the same thing with different names ?