The document discusses agreement in Spanish grammar. Adjectives must match the gender and number of the nouns they describe. For example, the adjective "alto" changes to "alta" to describe a female noun. Plural adjectives also change form, such as changing from "inteligente" to "inteligentes" in the plural. This concept of agreement is different from English and takes practice for learners to master. Paying close attention to examples of agreement will help uncover the patterns.