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

[WoodsPainting]

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

[ImpalaWardrobes]

What are Spiders, Robots and Crawlers and their functions? Spiders, Robots and Crawlers all are same these are automated software programme search engine use to stay up to date with web activities and finding new links and information to index in their database.

[RH-Calvin]

They are all the same and are automated search engine programs that are responsible to read through webpage sources to provide information to search engines.