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

[virginoilseom]

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

[erieki]

Spiders, Robots and Crawlers are all the same.

The search engine spiders, crawl throughout the web. The content they come across are indexed in their massive search indices. The webpages that are indexed, are grouped according to their authority, trust, high-quality content and the number of backlinks.