This document provides a literature review on the use of authentic materials in promoting vocabulary in ESL classrooms. It defines authentic materials as materials produced for purposes other than language teaching. It discusses the advantages of using authentic materials, including improving motivation, exposing students to real language and culture, and better preparing students for the real world. It also identifies some potential challenges, such as materials containing difficult language beyond students' levels. The document reviews different types of authentic materials and considers factors like students' proficiency levels that influence material selection.