Final answer:
The tool or method used to manage product and sprint backlogs while visualizing the flow of work and identifying bottlenecks in Agile development is called a Kanban board.
Step-by-step explanation:
The tool or method used to manage product and sprint backlogs while visualizing the flow of work and identifying bottlenecks in Agile development is called a Kanban board.
Kanban boards are visual representations of work that allow teams to track and manage their progress.
They typically consist of columns representing different stages of work, such as 'To Do', 'In Progress', and 'Done', and use cards or sticky notes to represent individual tasks or user stories.