Roasters are machines or devices used to cook and prepare food, primarily by applying dry heat. They are commonly used for roasting meats, vegetables, and even coffee beans. The process involves circulating hot air around the food, which helps to create a crispy exterior while keeping the inside tender and juicy. In the context of coffee, a coffee roaster is a specialized machine that transforms green coffee beans into roasted beans, enhancing their flavor and aroma. Roasting can vary in temperature and duration, resulting in different roast levels, such as light, medium, or dark, each offering unique taste profiles.