Carbohydrates are essential macronutrients found in a variety of foods, including grains, fruits, vegetables, and dairy products. They serve as the primary source of energy for the body, particularly for the brain and muscles. Carbohydrates are classified into two main types: simple carbohydrates, which include sugars like glucose and fructose, and complex carbohydrates, such as starches and fiber. While simple carbohydrates provide quick energy, complex carbohydrates are digested more slowly, providing sustained energy. Despite their importance, it's essential to consume carbohydrates in moderation and focus on whole, unprocessed sources to maintain a balanced diet.