A Kanban board is a visual tool used to manage and track work in progress. It typically consists of columns representing different stages of a workflow, such as "To Do," "In Progress," and "Done." Tasks are represented by cards that move across these columns as they progress, helping teams visualize their workload and prioritize tasks effectively. Originally developed in the Toyota Production System, Kanban boards promote efficiency and limit work in progress to avoid bottlenecks. They can be used in various fields, including software development, project management, and personal productivity, making them versatile for different teams and projects.