Olefins are a group of unsaturated hydrocarbons that contain at least one carbon-carbon double bond. They are important building blocks in the chemical industry, primarily used to produce various plastics, synthetic fibers, and other chemicals. Common examples of olefins include ethylene and propylene, which are derived from fossil fuels and are essential for manufacturing products like polyethylene and polypropylene. These compounds are typically produced through processes such as cracking and polymerization. Olefins can also be found in natural sources, such as in some essential oils. Their versatility and reactivity make them crucial for creating a wide range of materials used in everyday life.