Hexoses are simple sugars, or monosaccharides, that contain six carbon atoms. They are important energy sources for living organisms and play a crucial role in various metabolic processes. Common examples of hexoses include glucose, fructose, and galactose. These sugars can exist in linear or ring forms and are often found in nature as components of larger carbohydrates, such as disaccharides and polysaccharides. Hexoses are vital for cellular respiration, where they are broken down to release energy for biological functions.