A superlative is a grammatical form used to express the highest degree of a quality among three or more items. It often involves adding the suffix "-est" to an adjective, such as in the words tallest or fastest. In some cases, the word "most" is used before adjectives with more than one syllable, like most beautiful or most interesting. Superlatives help to compare and highlight differences, making it clear which item stands out. For example, in a group of animals, saying the cheetah is the fastest emphasizes its speed compared to others. Superlatives are commonly used in everyday language, advertising, and literature.