Cannabigerol also known as CBG is the stem molecule that produces all other cannabinoids found in the cannabis plant. This is why you may hear CBG be referred to as the "parent" molecule in cannabis. When CBG is ingested alongside other cannabinoids you're boosting the effects of the cannabinoids, which is as "the entourage effect". CBG also has benefits unique to itself that you wont find in other cannabinoids.
You can get a thorough introduction to CBG in this video below.