What are Spiders, Robots and Crawlers and what are their functions?
Spider , Crawler , or Bot are all terms used to describe a tool ( software ) to crawl for search engines - Search Engine , collectively called Web Crawler . This software is designed to be able to browse websites on the World Wide Web a systematic way , with the purpose of collecting information on those sites for search engines ( crawl data ) , aims to save indexing those sites to the database of Search engine. At the same time , help the search engines that offer the most accurate assessment of data collection website .
Spiders, Robots and Crawlers all are same these are software programme search engine use to stay up to date with web activities and finding new links and information to index in their database. Search engines created some automated programmes to keep their database updated which goes from site to site and find the new data for search engine also collects the information about the web page what is the page all about.
-Spiders create a text-based summary of content and an address (URL) for each webpage.
-Crawler is a program that automatically follows all of the links on each web page.
-Robots is An automated computer program that visit websites & perform predefined task.