The chapter-I introduces nitrogen and oxygen-containing heterocycles, emphasizing their importance in medicinal chemistry, materials science, and agriculture. Compounds like imidazopyridines and oxadiazoles are highlighted for their versatile biological activities, including antimicrobial, antiviral, and anticancer properties, making them valuable scaffolds in drug development. The chapter -II focused on the synthesis and antibacterial studies of imidazopyridinyl-1,3,4-oxadiazoles, this chapter details environmentally friendly and efficient methods for their preparation. The synthesized...