Comparative and Superlative Adjectives

comparative form of the adjective: taller, bigger, more attractive, less fashionable + than.
Ex.: John is taller than Mark.
To say that one person or thing in a group is unique we use the superlative form of the adjective: the tallest, the biggest, the most attractive, the least fashionable.
Ex.: Peter is the tallest student in our class. (He is taller than all the students.)