With Broad Spectrum CBD, other cannabinoids are present, serving as a catalyst to allow for the best CBD experience. Broad Spectrum is great for those who want the benefits of the entourage effect but with no THC.
Very similar to Broad Spectrum, the difference here is that Full Spectrum contains noticable amounts of THC, the chemical compound in cannabis that creates the psychoactive experience.
Isolate CBD lacks the other cannabinoids that work in concert to reach the full potential of CBD in the body. Isolate is the most common CBD found on shelves today.