Hashish (pronounced /hæˈʃiːʃ/ or /ˈhæʃiːʃ/) (from Arabic: حشيش ḥashīsh, lit. “grass”, from hashsha “to become dry”; also hash) is a preparation of cannabis composed of the compressed stalked resin glands called trichomes, collected from the cannabis plant. It contains the same active ingredients but in higher concentrations than other parts of the plant such as the buds or the leaves. Psychoactive effects are the same as those of other cannabis preparations such as marijuana. It is sometimes believed that the effects are different, but those differences usually stem from variations between regionally different Cannabis specimens, that are more traditionally processed into hashish.
Hashish is often a solid or paste-like substance of varying hardness and pliability, and will soften under heat. Its color can vary from green, yellow, black, reddish brown, or most commonly light to dark brown.
It is consumed in much the same way as cannabis buds, used by itself in a screened miniature smoking pipe, hookah, bong or bubbler, vaporized, hot knifed, or smoked in joints mixed with tobacco, cannabis buds, or other herbs.
It can also be eaten alone as well as used as an ingredient in food. en.wikipedia.org