An introductory essay by Garth Fletcher, written for the Complex Weavers Jacquard Study Group, explaining how Jacquard shedding differs from dobby, drawloom and shaft (harness) looms. It describes the griffe, hook and sensing-pin mechanism, the move from pasteboard cards to endless paper and electronic control, and hook counts and head sizes. It also covers harness cords and pattern repeats, choosing hook counts so weaves repeat cleanly across seams, hooks used for weft selection and other functions, and the TC-1 and TIS/SAMT hand-loom Jacquards. It closes with trends in Jacquard design and production, illustration sources and a reading list.