There are six types of adjectives: descriptive, limiting, pronominal, possessive, proper, and predicate. Adjectives can also be categorized into three degrees: positive, comparative, and superlative. The positive degree expresses no comparison, comparative compares two things, and superlative compares more than two things. Adjectives modify or describe nouns and can be used to limit, show ownership, or act as a complement in a sentence.