What is friction? (explain if full sentences)

The resistance that one surface or object encounters when moving over another. The action of one surface or object rubbing against another.

Answer: what comes to mind when we hear the word "Friction"?

Basically friction is a "Force" that opposes an intend (ing) motion.

Explanation:

By motion I mean movement.

By force I mean a body that carries with it energy.

So to understand this better, just see it as a force (thing) that prevents or stops you from taking action.