Intensifiers are adverbs that enhance adjectives and adverbs. In English, they come
before the words they modify.

Examples:

It’s quite hot today.
Ms. Stress is really busy right now.
He’s my very best friend.
I’m a little tired today.
That was a pretty good shot.
Sam just got a brand new car.
I know her fairly well.
It's extremely hot outside.
You're absolutely right!