Comparative and superlative are forms of adjectives used to compare differences between two or more items. The comparative form typically adds “-er” or uses “more” before the adjective, such as in tall becoming taller or beautiful becoming more beautiful. This form is used when comparing two items, like Alice and Bob. The superlative form expresses the highest degree of a quality among three or more items. It usually adds “-est” or uses “most” before the adjective, such as tall becoming tallest or beautiful becoming most beautiful. This form is used to highlight the best or worst, like Alice being the tallest in her class.