Abstract: Knowledge Representation has become the primary requirement for the budding smart world. The process of Representing Knowledge includes capturing data, representing information and retrieving accurate knowledge. It is very much evident that only if the representation model is simple and clear, then the role of capturing and retrieval can be effectively performed. Recently, an urgent need for a more efficient knowledge representation model has increased to cater to modern culture. This research topic focuses on the representation models designed over the century. The main objective of this survey is to summarize the work that has been carried out in the area of knowledge representation models and to discuss a range of approaches and methods for representing knowledge.