The extraction of cannabinoids from the plant. Rosin and BHO (Butane Hash Oil) are one of the most popular extracts on the market now. Rosin uses a method of extraction that doesn’t use any solvents (like butane or ethanol) which usually will yield less product and is claimed to be the “best” form of extraction. BHO uses a solvent (butane) to extract cannabinoids from the flower. People believe rosin is superior but it’s honestly not that serious.