A crawler is a machine of the search engines that visits websites and read content or text. Its like a agent of search engines who visits websites and read and check content of the website. There are different types of crawler of different search engines that check genuine data. Crawler read only text if you want to promote your website then you should have real and genuine content in your website .
This process is called Web crawling or spidering.
Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data.
Web crawlers are mainly used to create a copy of all the visited pages for later processing by a search engine, that will index the downloaded pages to provide fast searches.
Crawlers can also be used for automating maintenance tasks on a Web site, such as checking links or validating HTML code.
Also, crawlers can be used to gather specific types of information from Web pages, such as harvesting e-mail addresses (usually for spam).
Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data.
Web crawlers are mainly used to create a copy of all the visited pages for later processing by a search engine, that will index the downloaded pages to provide fast searches.
Crawlers can also be used for automating maintenance tasks on a Web site, such as checking links or validating HTML code.
Also, crawlers can be used to gather specific types of information from Web pages, such as harvesting e-mail addresses (usually for spam).
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