Students will learn about friction in industrial practice and the use of lubricants. It is based on sliding and rolling friction in dry friction, mixed and fluid friction. Above all, the properties of liquid lubricants, both Newtonian and Non-Newtonian, are defined and the student is acquainted with the determination of their properties. In addition, sliding pairs and their behavior are defined in different friction types, the student is acquainted with the Stribeck diagram. Possible types of lubrication are listed - individual, circular, central. Finally, the methods for detecting the degradation of lubricants and methods of their variation or regeneration are presented.