Condensed matter physics is the field of physics that studies the macroscopic and microscopic physical properties of condensed phases of matter. These include solids and liquids, as well as superconducting, ferromagnetic and antiferromagnetic phases, Bose-Einstein condensates, etc. The theoretical understanding of condensed matter especially relating to the electronic properties of solids is furthered by various models such as Drude model, Band structure and density functional theory. Modern condensed matter physics involves the use of numerical computation to understand high temperature superconductivity, topological phases and gauge symmetries. This book brings forth some of the most innovative concepts and elucidates the unexplored aspects of condensed matter physics. The aim of this book is to present the researches that have transformed this discipline and aided its advancement. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.