Carbon materials are one of the most abundant and versatile materials known to us and can be found in its different forms such as graphite, diamond, carbon nano-tubes, graphene, fullerene, activated charcoal, etc. Their advantageous properties are well established and are being used by the pharmaceuticals industry to reduce abdominal pain, the toxicity of the body etc. since long back. Its application is not only restricted to the pharmaceutical industries, it also plays a significant role in the development of alternating clean and sustainable energy technologies. This book has been specifically designed to meet the academic as well as scientific requirements for the students, budding researchers and material scientist working in the field of biomass based activated charcoal and its various applications in the field of electro-chemical devices, adsorption techniques, desulphurization etc. This book is divided into various sections in which methods of activation, activating agents and application of activated carbons are covered. We are sure that this book will meet all our expectation and requirements. Any further suggestions and feedback are most welcome.