The document describes the purpose and structure of descriptive text. Descriptive text aims to describe people, places, or things by identifying the subject and providing details about its qualities and characteristics. The document then analyzes two examples of descriptive text - one describing the Borobudur Temple in Indonesia and one describing the writer's pet cat. Both examples follow the generic structure by identifying the subject in the first sentence or paragraph and then describing it through the use of adjectives, nouns, and present tense verbs.