Ethene polymerization is a chemical process in which ethene (also known as ethylene) molecules are joined together to form long chains called polymers. This process typically uses catalysts and controlled conditions to link the small ethene units (monomers) into a much larger molecule known as polyethylene. Polyethylene is one of the most widely used plastics in the world, found in packaging, containers, and many everyday products. The process can be carried out using different methods, such as high-pressure free radical polymerization or catalytic polymerization, each producing polyethylene with distinct properties. Ethene polymerization is crucial in the plastics industry due to the versatility and durability of the resulting material.