Cannabinoids are known chemical compounds that are found in Cannabis. Cannabinoids, like THC or tetrahydrocannabinol, stimulate receptors in the endocannabinoid system of our body. Thus, resulting in the "high" effect that users may experience, such as delusions, paranoia, drowsiness, etc.
However, not all Cannabinoids stimulate a "high" feeling. Cannabidiol or CBD is another type of Cannabinoids that is popular because of its medicinal use. Though CBD acts on some of the same receptors in our endocannabinoid system, it does not create any euphoria.
On the other hand, terpenes are responsible for the smell and aroma produced by Cannabis. It makes certain strains smell or taste different from others. Both Terpenes and Cannabinoids act in our endocannabinoid system. People believe that terpenes provide an entourage effect or enhance a person’s "high" feeling from using Cannabis. In short, it improves or alters the effects of THC and CBD when intake by our body.