This document discusses coenzymes and provides examples of important coenzymes. It defines coenzymes as loosely bound organic cofactors that aid the proper functioning of enzymes. Some key coenzymes discussed include ATP, NAD+, pyridoxal phosphate, coenzyme A, and biotin. The document also notes features of coenzymes like being thermostable and not enzyme specific. Finally, it briefly describes deficiencies that can result from a lack of certain coenzymes like biotin and NADPH.