Which compounds is known as oliffins and why

Obtained from the elements hydrogen and carbon, olefins, also known as alkenes, are organic compounds that contain one or more pairs of carbon atoms that are connected together by a single double bond. Unsaturated hydrocarbons such as olefins are examples of such compounds (compounds that contain only hydrogen and carbon and at least one double or triple bond).

Explanation:

Olefin is a chemical term that refers to oil formation, and it was originally used to ethylene since oil was generated when ethylene was treated with chlorine. It is currently applicable to any hydrocarbons containing linear C::C double bonds, regardless of their structure (not aromatic C::C double bonds).