Question

what are lubricants mention its importance​

Answer 1

Lubricants are substances that help reduce friction and hence enable free and smooth movement between surfaces. Some common examples are graphite, silicone, grease and oil.

They reduce wear and tear of machines and other parts. thus they increase the life of machinery

Answer 2

The substance which prevent the metals from rusting are lubricants.

It's importance is that is prevent metals from rusting eg. Grease paints etc.