Kanban cards are visual tools used in the Kanban method of project management to represent work items. Each card typically contains information about a specific task, such as its title, description, and status. These cards help teams track progress and manage workflow by moving them through different stages, such as "To Do," "In Progress," and "Done." In a Kanban system, cards are often placed on a board, allowing team members to see the status of tasks at a glance. This visual representation promotes transparency and helps identify bottlenecks, enabling teams to improve efficiency and prioritize work effectively.