Terpenes are a class of organic compound found in a number of plants throughout nature, not just in cannabis - they give a pine tree or lavender flower its distinct smell. You're already familiar with them, even if you've never heard of them before. They're also what give cannabis strains their distinct odor and properties. Terpenes are highly beneficial and therapeutic, and there are over 100 terpenes (or "terps") identified in the cannabis plant. Many people are just now discovering what they are and why they are in CBD vape oil to begin with. What truly makes a strain are 2 factors: the potency of the various cannabinoids and the types of terpenes present. The extent of their interaction with the brain and the body are still being discovered, but we do know terpenes have some complementary effects when ingested with CBD vape oil or a tincture.