This book is a modest attempt to provide a simple text for those who desire to equip with knowledge of herbal standardization, qualitative phytochemical investigation and antibacterial activity of herbal drugs. The authors have attempted to give as many illustrations as possible to make the concepts and principles clear to the reader. The large number of review materials is incorporated at each chapter after exhaustive survey of literature. We believe that this book will cater to the immediate needs of the students, researcher and the faculty members of the subject and will serve as an excellent book of its field. The book contains seven chapters which are systemically organized for the better understanding of the subject.