Sugar is a compound. Sugar, or sucrose, is composed of carbon, hydrogen and oxygen elements, and it has the chemical formula C12H22O11.
A compound is made up of the atoms of two of more different elements that have been bound together. These elements can be broken down by chemical means. The elements that make up a compound, when joined together, have properties that are different than the properties of the individual elements. Other examples of compounds are water and table salt.
An element, on the other hand, is made up of only one type of atom and cannot be broken down into a simpler matter by chemical or physical means. Examples of elements include argon and nitrogen.
Finally, a mixture combines two or more elements that are intermingled but can be separated easily. In the case of a mixture, each element retains its individual properties. Examples of mixtures include air and salt water.