Semantic web is an attempt to provide technology, standards, and methodologies to structure and describe the meaning of data on the web, and to make it easier to process by machines. Thus, allowing software to accomplish many of the tasks users must currently perform manually. The Semantic Web has attracted a diverse, but more important, community of researchers, institutes and companies, all sharing the belief that one day the Semantic Web will have a huge impact on our lives as the current web has. Therefore, there are a lot of work have been done in this area.

This paper gives an overview of Semantic Web and what have been done so far in the Semantic Web filed. Then, it highlights the current major challenges in this field.