crawlers and Spiders ?
 

There are difference between Crawler and Spiders.

1. Crawler: Crawler is used to crawl or index the pages from website.

2. Spiders: Spider is a application program used to scan the web pages from website.

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Both are difference...

Both are different but looks like they has same functionality.

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.

thanks for the info u thought me a new thing