Kanban is a visual tool used to organize and complete work. It involves breaking work down into distinct steps represented as columns on a board. Tasks are written on colored notes and moved from left to right as they are worked on. Kanban limits work in progress to a few tasks like juggling balls with two hands, reserving space and preventing pushing too much work, instead pulling work only when ready to maintain 100% capacity. The goal is to breakdown large goals into concrete steps visualized on the board to help work flow and keep teams productive.