Simply put, cannabis oil is the concentrated liquid extract of the marijuana plant, Cannabis sativa.
Similar to other herbal extracts, the chemicals in cannabis oils vary depending on how the extract is made and what chemicals were in the plant to begin with.
Cannabis plants produce thousands of compounds but the most well recognized belong to a class called cannabinoids. There are several cannabinoids but the two that are most well-known among consumers are THC (tetrahydrocannabinol) and CBD (cannabidiol).