Terpenes are molecules that are found in the oil of plants, such as sage, rosemary, broccoli, mangos, etc. These molecules are responsible for different flavors and smells, such as citrus, herbal, coffee, spice, and more. There are over 20,000 terpenes known at this time, and at least 100 of those are found in cannabis.
These, along with cannabinoids and flavonoids, can be found in the trichomes, which are produced by the female cannabis plant. Recent studies have shown that terpenes interact with our endocannabinoid system, and help cannabinoids produce a better effect through the entourage effect.
Some of the most common terpenes found in cannabis are myrcene, humulene, caryophyllene, and linalool.
Each with its own unique flavor and scent thought to contribute to the entourage effect to create different experiences when combined with various cannabinoids.
For a more detailed breakdown of some of the most common terpenes the cannacon website a leading cannabis business convention has a wealth of information on some of the most common terpenes found in cannabis.