Review of ontology based focused crawling approaches

Web now has become a great source of information now-a-days but this information is not sequentially stored rather stored in a hyperlinked form. The generic crawlers are not able to differentiate between relevant and related. So to improve over the results returned by the generic web crawlers, topic specific crawlers were designed called as focused crawlers. The focused crawler crawl a specific part of the web to retrieve the relevant resources. Here in this paper the comparative analysis of the various focused crawler is shown. It classifies two types of focused crawlers: the learning focused crawlers and the classical focused crawlers. The classical crawlers are again categorized into two as : Semantic focused crawlers and social semantic focused crawlers. The semantic focused crawlers combine ontology with the focused crawlers to get semantics of the search topic related to the web pages. The Social semantic works on the social network to get semantically related web pages shared between people of common interest.