This document examines and introduces the learner to energy. The reading will define energy and discuss topics such as (1) Potential energy, (2) Kinetic energy, (3) Conservation of Energy, (4) Energy Efficiency, (5) Sources of Energy, (6) Measuring Energy, (7) Energy use, (8) Who uses energy?, and (9) Energy use and prices. The document also depicts illustrations of energy transformations, efficiency of power plants, U.S. energy consumption by source, and percentage of energy use by industrial, commercial, residential, and transportation sectors. This resource is structured as an informational handout to supplement energy activities or to generate discussion questions.