Bullion refers to precious metals, such as gold or silver, in the form of bars, ingots, or coins. These metals are typically traded for investment or financial purposes and are valued based on their weight and purity.

Metals are elements characterized by their metallic properties, such as conductivity, malleability, and luster. In the context of commodities, metals often refer to both precious metals (like gold and silver) and industrial metals (like copper and aluminum).

Energy commodities refer to natural resources that can be converted into power. This category includes fossil fuels (like crude oil, natural gas, and coal), as well as renewable energy sources (such as wind, solar, and hydroelectric power).