With the increasing spread of internet and its application in various business processes and its profit by saving time and reducing place limitations via the web, a better observation was made for the several forms of trade boom to take better. However, this situation deals with a variety of risks with their various forms. Some studies show that these risks create negative attitude in users and they are the most important preventive factors in using e-commerce. The aforementioned factors caused complexity, challenge, ambiguous and risk feeling in the customers’ use of electronic capabilities. This paper analyzes the base researches in the theory of perceived risk and reviews the related research in two major dimensions of e-commerce: "Buying and selling products online and e-services". Also, the study compares the findings with existence researches in Iran, as a developing country. Consequently, we identify a general classification of the risks and their effects in e-commerce.
