This book covers a variety of subjects about high-temperature superconductors. I will start with fundamental and historical contexts, as well as explain key properties associated with superconductivity. The general theory of high-temperature conductors is also well discussed in this book. It explores the theoretical frameworks and models used to understand the behaviour of these materials at high temperatures. The chemistry behind these materials is also discussed. This book investigates the composition, structure, and electronic properties of high-temperature superconductors, highlighting the interplay between chemical factors and superconducting behaviour. The materials aspects of high-temperature superconductors for practical applications is another interesting topic which is well explored in this book. This includes engineering considerations, including the design, fabrication, and characterization of superconducting materials, with a specific focus on their potential applications in various fields. In addition, practical applications of high-temperature superconductors are covered. Finally, synthesis and fabrication techniques employed in the manufacturing of these materials are fully discussed. This book in fact brings together a diverse group of experts in the field of high-temperature superconductivity providing readers with a comprehensive understanding of the chemistry and applications of high-temperature superconductors. It can be used as a reference or textbook for students, researchers, engineers, and those who are interested in the topic