The technical definition of a terpenes probably won’t clear much up, but here it is: Any of a large group of volatile, unsaturated hydrocarbons found in the essential oils of plants, especially conifers and citrus trees. They are based on a cyclic molecule having the formula C10H16. They are the main plant resin or “essential oils” and contribute to the scent, flavor and colors of plants.
Here is a short video from Leafly, an recognized industry partner, with an Introduction on Terpenes that Relate to Cannabis
As that video closes with, Terpenes are The Next Frontier of Discovery.
The easiest way to get your mind around them (albeit not 100% correct) is to think of them as essential oils. Essential oils typically have effects on people. For instance, Lavender typically causes one to be sleepy. Various terpenes also have effects on people. And, that’s what we’re aiming for…their effects. For most people, they are subtle effects, but they are definite effects none the less.