What are Crawlers

please any one say What are Crawlers?
How do they work?
what are the need of crawlers to SEO ?

 

It's the program that search engines send out to find and read sites, also known as a spider or bot.
No crawlers, no search engines, no seo.

 

For more information on how they work, exactly, look at Google's Webmaster Essentials page (go to google webmaster tools). There's plenty of good stuff there for you...

 

Without crawlers you won't get any results when you use a search engine.

 

read this book: http://www.seobook.com/

 

Crawler; a person who tries to please someone in order to gain a personal advantage
Crawler; a person who crawls or creeps along the ground
Crawler; another name for a news ticker

Alright enough fun and games. I think you have the concept of a crawler wrong, a crawler or a search engine bot is the work of search engines. Crawlers will scan the internet to add web pages to a search engines index. You can learn a lot more by reading: http://en.wikipedia.org/wiki/Web_crawler

...and yes my 3 initial responses to a crawler are also correct

 

Thanks a lot!