Adjectives in Spanish modify nouns to provide additional information about their properties or qualities, similarly to English. They can be placed before or after the noun, or separated from it. Adjectives agree with the gender and number of the nouns they describe. There are positive, comparative, and superlative forms to indicate different levels or degrees of a quality. Common types of Spanish adjectives include descriptive adjectives, demonyms, pronominal adjectives, and others derived from verbs or nouns.