In today’s world, online advertisements are very famous with number of industries, which includes mining service industry. Web crawler are of the most critical components used by the search engines to collect pages from the web. It is an intellectual technique of browsing used by the search engines. Service users may faces the three major problemsheterogeneity, ubiquity and ambiguity at time of searching for information over the internet. The framework of a self-adaptive semantic focused crawler i.e. SASF crawler have the purpose of precisely and efficiently discovering, formatting and indexing mining ploy information over the internet by taking into account these three major problems. This framework incorporates the technologies of semantic focused crawling and ontology learning to maintain the performance of this crawler. In this paper number of literature survey are taken into account with their drawback.
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