Carbohydrates are chemically composed of carbon and water, hence the name carbohydrates. 

Simple carbohydrates, such as glucose or fructose for example, tastes sweet and are also referred to as monosaccharides or sugars. Carbohydrates also occur in a form where many sugar molecules are linked together, so called polysaccharides or complex carbohydrates. 

Complex carbohydrates are the carbohydrates usually consumed as part of food, the most common one being starch which is contained in bread and pasta. Another important complex carbohydrate is glycogen which is used as a carbohydrate storage in the liver. Complex carbohydrates do not taste sweet due to their different chemical structure, you might have already noticed however that bred, when thoroughly chewed in your mouth, starts tasting sweet after some time. This is because digestion occurs in the mouth already and when enzymes break down starch, sugars are released.
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