Full-spectrum CBD oil, also known as whole plant, mixes CBD with cannabis-derived terpenes, a trace amount of THC, as well as lesser-known cannabinoids such as cannabigerol (CBG) and cannabinol (CBN). Consuming full-spectrum CBD oil tends to create what's called the entourage effect, a phenomenon that occurs when cannabinoids and terpenes work together synergistically to produce a greater effect.
Broad-spectrum CBD oil contains a similar array of cannabinoids and terpenes but without the trace amounts of THC. Additional processes can remove as much THC from the CBD oil as possible, while still maintaining other cannabinoids and terpenes.
Isolates are made by stripping away all other cannabinoids and terpenes, resulting in a crystalline powder that is pure CBD. Product labels should denote if the CBD oil is isolate-based or contains other cannabis-based compounds. Since the isolated form of CBD comes in a crystalline powder, it's usually mixed with a carrier oil, typically coconut or olive oil.