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What is Spidering ?

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Spiders are programs (or automated scripts) that 'crawl' through the Web looking for data.
Spiders travel through website URLs and can pull data from web pages like email addresses.
Spiders also are used to feed information found on websites to search engines.
Spiders, which are also referred to as 'web crawlers' search the Web and not all are friendly in their intent.
Spiders and other automated tools are used by spammers to find email addresses (on the internet this practice is often referred to as 'harvesting') on websites and then use them to create spam lists.
Spiders are also a tool used by search engines to find out more information about your website, but left unchecked, a website without instructions (or, 'permissions') on how to crawl your site can present major information security risks. Spiders travel by following links and they are very adept at finding links to databases, program files, and other information that you may not want them to have access to.
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