A superlative adjective is a form of an adjective used to describe the highest degree of a quality among three or more items. For example, in the phrase "the tallest building," the word "tallest" indicates that one building is taller than all others in comparison. Superlative adjectives often end in "-est" or are preceded by the word "most," such as "most beautiful." Superlative adjectives help to convey clear comparisons and highlight extremes. Common examples include best, worst, fastest, and smartest. They are useful in everyday language, allowing us to express opinions and make distinctions between different subjects effectively.