Kanban is based on four core principles that guide its implementation and practice. To begin with, Kanban uses a visual board to display work items and their status, such as "to do", "in progress", and "done" - this helps teams see the big picture and monitor progress. Additionally, Kanban limits the number of work items that can be in each status, creating a constraint that prevents overloading the system and encourages focus and quality. Furthermore, Kanban tracks the flow of work items through the system, measuring metrics such as lead time, cycle time, and throughput. This helps teams optimize the flow, reduce waste, and deliver faster. Finally, Kanban promotes a culture of continuous improvement where teams inspect and adapt their processes, policies, and practices based on feedback and data.