A heterocyclic aromatic organic compound that is produced by fusing benzene and imidazole is referred to as benzimidazole. It is a colorless solid and is often bioactive. Many anthelmintic drugs such as albendazole, mebendazole, triclabendazole belong to the benzimidazole class of compounds. Benzimidazole fungicides act by binding to the fungal microtubules and stopping hyphal growth. Omeprazole, lansoprazole, pantoprazole, rabeprazole, and tenatoprazole comprise a benzimidazole group. Benzimidazole can be used as an organic solderability preservative in printed circuit board manufacturing. Several dyes are extracted from benzimidazoles. This book presents the complex chemistry of benzimidazole in the most comprehensible and easy-to-understand language. It elucidates the concepts and innovative models around prospective developments in the application of benzimidazole. Scientists and students actively engaged in this field will find this book full of crucial and unexplored concepts.