Kief (from Moroccan Arabic كيف kīf, "Joy, pleasure"), sometimes transliterated as keef, also known as ‘’Dust’’ and "Chief" a.k.a cannabis crystals among other names, refers to the pure and clean collection of loose cannabis trichomes, which are accumulated by being sifted from cannabis flowers or buds with a mesh screen or sieve. Like some other cannabis concentrates, it contains a much higher concentration of THC and other psychoactive cannabinoids than that of the cannabis flower from which it is derived. Since it contains a higher level of THC, many consumers choose to add collected kief to their cannabis for a more intense "high"; by the same token, this preparation may induce unwelcome levels of intoxication.
Traditionally, kief has been pressed into cakes of hashish for convenience in storage, although it can be vaporized or smoked in either form. After the kief is collected it is heated and pressurized, resulting in hashish.