In my book I highlighted the importance of the Semantic Web and its technologies. Also I illustrated how to build the ontology with its relations and how to implement it in the semantic query. The Semantic Web is proposed as a solution to solve the problems faced by a traditional search method in the web where the crowded of electronic documents and the number of results in billions depends on key words only. I introduced Palestine ontology which clarifies the relations between governorates the cities and villages in the administrative division of Palestine.