Epoxides, also known as oxiranes, are highly reactive three-membered cyclic ethers characterized by an oxygen atom bridging two carbon atoms. These compounds are used as versatile intermediates in the synthesis of various chemicals and polymers. Epoxides are integral in the production of epoxy resins, which have applications in adhesives, coatings, and composite materials. They are also used in organic synthesis as powerful tools for ring-opening reactions.