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But I have found these definition
Spider - a browser like program that downloads web pages.
Crawler – a program that automatically follows all of the links on each web page.
Robots - An automated computer program that visit websites & perform predefined task. They are guided by search engine algorithms & are able to perform different tasks instead of just one crawling task. They can combine the tasks of crawler & spider together and help in indexing and ranking of websites on any particular search engine.
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