Chemicals are substances that have a distinct molecular composition and are typically produced through various chemical processes. Chemicals can be grouped based on their molecular composition and structural characteristics. The Middle East is home to large-scale petrochemical complexes that produce a wide range of petrochemicals, including ethylene, propylene, polyethylene, polypropylene, methanol, ammonia, and more. The chemical industry refers to the sector of the economy that is involved in the production, manufacturing, and distribution of chemicals and chemical products.