The first type of CBD is CBD isolate, which contains pure CBD in crystalline form. Full spectrum CBD contains trace amounts of THC, which naturally occur in the hemp plant. It also contains terpenes, which are cannabis derived, as well as other minor cannabinoids, in addition to the CBD.
Broad spectrum cannabidiol is comprised of all of the cannabinoids, but contains no THC. It is an optimal choice for those who do not want THC added to the CBD, for various reasons.