The book "Thermal Energy Storage Using Phase Change Materials" provides a comprehensive introduction to the use of solid-liquid phase change materials for storing significant amounts of energy in the latent heat range. It discusses the careful selection of suitable materials for various applications and the use of high-conductivity additives to enhance thermal diffusivity. Dr. Amy S. Fleischer examines the developments of the past ten years, during which the applications of phase change materials (PCMs) have grown, including the development of efficient building materials to reduce heating and cooling needs, smart material designs for clothing, thermal management of portable electronic systems, and the design of solar thermal power plants. Additionally, future research directions and challenges are discussed.