Macromolecules are large, complex molecules essential for various biological functions. They include proteins, nucleic acids (DNA and RNA), carbohydrates, and lipids. Each type of macromolecule plays a crucial role in maintaining the structure and function of living organisms. For instance, proteins serve as enzymes, structural components, and signaling molecules. Nucleic acids store and transmit genetic information, carbohydrates provide energy and structural support, while lipids contribute to cell membranes and energy storage. Understanding macromolecules is fundamental to studying biochemistry and molecular biology.