Definition of Spider
Spider is used as both a noun and a verb. Search engine spiders (aka "spiders") are software applications used by search engines to index web pages. They "spider" the web by following links from one page to another.
A site is said to have been spidered after a search engine has crawled and indexed its contents.
Please let us know if you have a term you would like to see added to the Internet Marketing Glossary.