Chemistry is the branch of science that studies the composition, structure, properties, and changes of matter. It delves into the interactions between atoms and molecules, which are the building blocks of all substances. This field explores various forms of matter, including solids, liquids, gases, and plasmas, and the energy changes accompanying chemical reactions. Chemistry is divided into several subdisciplines, such as organic chemistry, which focuses on carbon-containing compounds; inorganic chemistry, which deals with minerals and metals; physical chemistry, which combines chemistry with physics to study matter's physical properties; and biochemistry, which examines chemical processes within living organisms. By understanding chemical principles, new materials, medicines, and energy solutions, scientists can be developed making chemistry crucial for advancements in technology, healthcare, and environmental sustainability. The objective of this book is to give a general view of the different areas of chemistry, and its applications. Such selected concepts that redefine the field of chemistry have been presented in this book. A number of latest researches have been included to keep the readers up-to-date with the global concepts in this area of study.