Hidden Web Data Extraction Tools

Hidden web forms 99% of the total web. The hidden web contains the high quality content and has a broad coverage. So hidden web has always remained like a golden apple in the eyes of the researcher. A lot of research has been carried out in this area. The different tools have been created by the researchers to make the hidden web float on the surface of WWW. The different kind of crawlers and the search engines have been developed which focuses on the hidden web. So in this paper we discuss the various kinds of web crawlers and search engines which throw some light on the hidden web. Keywordsidden web; surface web; WWW; crawlers; search engines