A terpene is a scented molecule found in many plants, responsible for a plant's flavor and fragrance. Among the terpenes typically found in cannabis are linalool, limonene, pinene, myrcene, and caryophyllene. Terpenes provide not only an aromatic experience, but they are thought to also play a role in the effects of cannabis, as well as cannabinoids.
Terpenes have therapeutic properties on their own, but they also work beautifully with cannabinoids, a phenomenon known in the scientific community as the "Entourage Effect."