What are Spiders, Robots and Crawlers?
 

What are Spiders, Robots and Crawlers and what are their functions?

Spiders are also known as google bots which do indexing crawling and scans the www automatically and download the copy of its content on its database.

Spider is one of the Software, Crawling is basically when the search engine spider visits a page, Indexing is when the spider records the page and starts displaying the page in search or counting the link for SERP movement.

Spider is one of the software,crawling is basically when the search engine spider visits a page,Indexing is when the spider records the page and starts displaying the page in search.

Spiders are also known as google bots which do indexing crawling and scans the www automatically and download the copy of its content on its database.

Spider is one of the Software, Crawling is basically when the search engine spider visits a page, Indexing is when the spider records the page and starts displaying the page in search or counting the link for SERP movement.

Spider is one of the Software,Crawling is basically when the search engine spider visits a page,Indexing is when the spider records the page and starts displaying the page.

It's google own software which do indexing and caching of website/pages

A spider is a program run by a search engine to build a summary of a website’s content (content index). Spiders create a text-based summary of content and an address (URL) for each webpage.

The crawler is programs used by search engines to explore the Internet and automatically download web content available on websites. It's known also Robot, Bot or Spider.

Robots are programs that follow links on Web sites, gathering data for search engine indexes. They are considered robots rather than programs because they are somewhat independent: no programmer has told them what pages to find. Other names for these programs are spider or crawler