The DEM is a numerical technique widely used for modeling granular materials, where the motion and interaction of individual particles are considered. One of the critical aspects of DEMDiscrete Element Method (DEM) simulations is the accurate representation of contact mechanismsMechanisms between particles. Understanding these contact mechanisms is essential for predicting the behavior of granular systems under various conditions. This chapter introduces different contact models, each offering a unique perspective on how particles interact at the microscale. Additionally, the contact parametersContact parameters are also introduced in detail.