Adjectives are words used to describe nouns and pronouns. There are different types of adjectives including descriptive adjectives, adjectives of number/quantity, demonstrative adjectives, interrogative adjectives, and possessive adjectives. Adjectives also have degrees of comparison - the positive degree, comparative degree, and superlative degree. The comparative and superlative degrees are formed by adding suffixes like "-er" and "-est" or by using more/most with adjectives of more than three syllables.