Drug discovery is a vast area of research due to increase in bacterial and fungal resistance against available drugs. This book will give the basic concepts of Schiff-Mannich Base derivatives of Benzimidazole, Metal complexes and their application in the field of drug discovery. It will also provide the basic mechanistic study as well as the knowledge about characterization techniques which will be helpful for young students and researchers to have a deep insight about Antibacterial and Antifungal agents.