The goal of this study is to analyse friction in the situations it usually manifests itself, explain what exactly friction is, and why does it occur. Friction as a force that appeares between two bodies in physical contact has a significant influence on todays world and sufficient knowledge on the laws of friction is needed if we want to achieve maximum efficiency in mechanical engineering. In its inception on the molecular level, the forces of friction measuring at neglible ammounts on the macro level has enabled the shaping of the world as we know it. Friction is split into static friction and kinetic friction, including the limiting friction as the maximum force of static friction. Significant situations in which friction occures is the sliding friction which defies two objects moving against each other, rolling friction of a cylindrical object which is proportional to the ressistance of a cylindrical object and the deformation of the substrate, angle of friction and the fluid friction.