Glass is a transparent amorphous solid which is non-crystalline. It has a wide range of uses including practical, decorative and technological applications. The field of physics which studies characteristics and properties of glass is known as glass physics. Glass transition is the reversible and gradual transition in amorphous liquids from a brittle glassy stage into viscous stage. Its transition takes place when the temperature is increased. The temperature at which it takes place is called its glass transition temperature. Glass defects are central to glass physics. It is broadly applicable to domains ranging from computer science to biophysics and soft condensed-matter physics. This book provides comprehensive insights into the field of glass physics. Also included herein is a detailed explanation of the various concepts and applications of this field. Through this book, we attempt to further enlighten the readers about the new concepts of glass physics.