Carbohydrates are one of the three main macronutrients, alongside proteins and fats. They are organic compounds made up of carbon, hydrogen, and oxygen, and they serve as a primary source of energy for the body. Carbohydrates can be classified into simple sugars, like glucose and fructose, and complex carbohydrates, such as starch and fiber. When consumed, carbohydrates are broken down into glucose, which is used by cells for energy. Foods rich in carbohydrates include grains, fruits, vegetables, and dairy products. While they are essential for a balanced diet, it's important to choose healthy sources to maintain overall health.