Question

What do you mean by friction ?

Answer 1

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
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Answer 2

friction is the force which act opposite in the direction of another force produce on object.

It is of three types
1) Static friction
2) Sliding friction
3) Rolling friction