What is the classification of matter in sugar?

Scientifically, sugar is classified by its chemical composition. For example: dextrose, maltose; fructose, etc.

Sugar is classified for sale in markets and for use in cooking mostly by its origin, the source from which it was derived and/or its physical form. For example: cane sugar, beet sugar, maltose, molasses, syrup, granular sugar, frosting or icing sugar, etc.