A superlative adjective expresses the extreme or highest degree of a quality. We use a superlative adjective to describe the extreme quality of one thing in a group of things.
In the example below, "biggest" is the superlative form of the adjective "big":
In this lesson we will look first at how we make superlative adjectives, and then at how we use them:
We can use superlative adjectives when talking about three or more things (not two things).