Tribology of polymers is very interesting area of research. The selection of polymers as materials for sliding (as well rolling) components of machines and devices is very important task for tribologists. Nonpolymer-on-polymer as well as polymer-on-polymer contacts are important nowadays in design of machines and devices in modern technology. Understanding or tribological processes is very crucial. Tribological behaviour of polymeric tribosystems both for non-polymer-on-polymer and polymer-on-polymer combinations are discussed in this paper.