This article reviews the role of relevance in text processing. It argues that relevance instructions provided by instructors and texts help readers identify text segments that are germane to a reading goal. A taxonomy of relevance instructions is presented and four basic types of relevance manipulations are considered (i.e., targeted segments, elaborative interrogation, perspective, and purpose). This article also describes a four-stage goal-focusing model to explain how relevance affects attention allocation and text understanding. Directions for future research and educational implications are also discussed.