An adjective is a describing word that provides information about a noun, such as what kind or how many. Adjectives can follow forms of the verb "to be" and are used with articles like "a", "an", and "the" depending on if the noun is singular or plural. Adjectives can be compared using suffixes like "-er" and "-est" or modifiers like "more", "most", "better", "best", "worse", and "worst" depending on if two or more than two items are being compared.