Question

what is a friction and with suitable example

Answer 1

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
friction helps in writing walking etc

Answer 2

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

There are several types of friction:
Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.