An automatic lubrication system (ALS), often referred to as a centralized lubrication system, is a system that delivers controlled amounts of lubricant to multiple locations on a machine while the machine is operating.

Lubricating systems are used to introduce oil, grease and other lubricants to moving machine parts. The lubricants reduce friction between parts, and therefore increase the longevity of all components. Without lubrication, most machines would overheat or suffer extreme damage.

So a lubricant is a substance that reduces friction, heat, and wear when introduced as a film between solid surfaces. Using the correct lubricant helps maximize the life of your bearings and machinery, therefore saving money, time, and manpower, thus making operations more efficient and more reliable.

The way to reduce friction between two moving parts is to lubricate them (coat them in oil)—but how does lubrication actually work? Solids are materials that have a built-in resistance to changing shape, whereas liquids can flow.