NADH Dehydrogenase is an essential enzyme found in the mitochondria of cells. It plays a crucial role in the process of cellular respiration by facilitating the transfer of electrons from NADH to the electron transport chain. This process helps generate energy in the form of ATP, which is vital for various cellular functions. The enzyme is part of a larger complex known as Complex I, which is the first component of the electron transport chain. By oxidizing NADH, NADH Dehydrogenase contributes to the production of a proton gradient across the mitochondrial membrane, ultimately driving the synthesis of ATP through oxidative phosphorylation.