Currently, the Internet is considered as the largest medium and the most important tool for transferring and exchanging information. Besides the benefits and facilities of this "worldwide web", the possibility of crime occurrence has been doubled. Offenses which are now threatening citizens' safety, behavior and welfare, did not exist in the past at all. The present study investigates properties and factors which double the risk and damage of internet crimes. Findings revealed that on one hand internet crimes have unique characteristics such as global aspect, ease of perpetration, extent of damage, multiplicity of victims and crime detection-related issues and the like and on the other hand, internet criminals and victims differ from other criminals and victims in terms of age, gender, motivation and others.