Any plant or part of a plant which is used for its scent, flavor or healing properties is defined as herb. Herbal medicine is the study of botany of such plants which have therapeutic uses. Herbal drugs are a part of traditional medicine. Many conventional drugs such as morphine, aspirin, quinine and digoxin have plant origins and are still used extensively. Herbal medicines are not limited to the use of plants only. They also include the use of fungal and bee products, minerals and certain animal parts. Herbal medicine or herbalism is also known as phytomedicine. The objective of this book is to give a general view of the different areas of herbal medicine and its applications. From theories to research to case studies related to all contemporary topics of relevance to this field have been included in it. This book is a vital tool for all researching or studying herbal medicine as it gives incredible insights into emerging trends and concepts.