Brick hash is a traditional, solvent-free cannabis concentrate made by compressing sifted cannabis trichomes (kief) under heat and pressure into dense, brick-like blocks, popular for centuries in the Middle East, Central Asia, and North Africa, offering potent effects and rich flavor. It's known for its chocolate-bar-like appearance and is a classic form of hashish, often darker and denser than modern extracts, with variations depending on the input flower, heat, and pressure used.