Comparison in English grammar is when we show the differences or similarities between two or more things. We use comparative forms (such as "bigger," "more interesting") when comparing two things, and superlative forms (such as "biggest," "most interesting") when comparing three or more things. Comparisons help us describe the qualities of people, things, or actions. We use adjectives and adverbs to make comparisons, and we often use "than" to connect the things being compared. For example, "The elephant is bigger than the mouse."