Cell metabolism refers to the series of chemical reactions that occur within cells to maintain life. These processes convert nutrients from food into energy, which is essential for cellular functions. Metabolism is divided into two main categories: catabolism, which breaks down molecules to release energy, and anabolism, which uses energy to build cellular components. Enzymes play a crucial role in cell metabolism by speeding up these chemical reactions. The energy produced during metabolism is often stored in the form of adenosine triphosphate (ATP), which cells use to perform various tasks, such as growth, repair, and reproduction.