Kief, also known as keef or keif, is a fine powder made from the trichomes of the cannabis plant. Trichomes are the tiny, crystal-like structures on the surface of the leaves and buds of the cannabis plant that contain high concentrations of cannabinoids and terpenes. Kief is known for its potent effects because it is essentially a concentrated form of these compounds.

Kief is often collected in cannabis grinders with a screen to separate it from the ground-up plant material. It can be used in various ways, such as sprinkling it over the top of cannabis in a bowl, joint, or blunt to enhance potency, or it can be pressed into hashish. Additionally, kief can be used to make cannabutter for edibles. It's valued for its high potency and is considered a delicacy among cannabis enthusiasts. The word "kief" comes from the Arabic word for "joy" or "pleasure".