There are three main types of CBD: Full spectrum, Broad spectrum, and Isolate.

Full Spectrum means it is made from the whole plant. These oils include CBD as well as all the other cannabinoids found in the plant including THC, together with terpenes and flavonoids. This allows the full entourage effect to take place. When derived from hemp the max THC will be 0.3%.

Broad Spectrum means it is made from the whole plant minus THC. These oils include CBD as well as all the other cannabinoids found in the plant together with terpenes and flavonoids. This allows a partial entourage effect to take place.

Isolate means that everything other than CBD has been removed. No entourage effect is therefore possible.

And click here for a Pictorial representation of the differences