Dec
Deep web searching is fundamentally a different beast than surface web searching. Surface web crawlers like Google follow a known set of links to discover new web pages and to grow their list of links. While they’re following links the surface web crawlers are also grabbing the content and indexing it for human search.
Deep web search engines don’t follow links to find content, they fill out and submit search forms much the way humans do. Federated search engines, like deep web search engines, don’t use the crawl approach; they search content sources using either the deep web approach or via some other mechanism to access its documents. Each content owner provides its own mechanism for content search and document retrieval.
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