Macromolecules are large, complex molecules that are essential for life. They are made up of smaller units called monomers, which join together to form long chains. The four main types of macromolecules are proteins, carbohydrates, lipids, and nucleic acids. Each type plays a unique role in biological processes, such as providing energy, supporting cell structure, and storing genetic information. These macromolecules are found in all living organisms and are crucial for growth and development. For example, proteins help build and repair tissues, while carbohydrates serve as a primary energy source. Understanding macromolecules is key to studying biology and the chemistry of life.