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

[SEOShark]

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

[rahul3214]

Spiders, Robots, Crawler are the same thing. Search engine see your website which part they pick or which not.

[RH-Calvin]

They are all the same and are automated search engine programs that are responsible to read through various webpage source and provide information to search engines. They help to cache and index webpages in search engines.

[ShreyaKoushik]

Spider- 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.

Crawling- Crawling takes place when there is a successful fetching of unique URIs which can be traced from valid links from other web pages.

Bots or robots - Crawler bots and robots are same. This is an application written in programming language. This application is used to fetch new and existing websites, web page from net. All search engines have their own crawlers.

[ram.sh]

It all 3 are same and it works find new and update links then it is crawlers and index pages.

[spindlow2016]

Robots, Spider and Crawler these all are same thing and they help search engine to discover the page of the website and index in the search engines database for display result.