Kanban boards help you find the flow in your work: Instead of a simple list of tasks, your large tasks can be broken into different stages (in columns), and as you move from one stage to another, you can drag the task over to the next section. Kanban boards are useful when you're collaborating with team members, or when you're dealing with tasks that take two or more steps before they're actually done. Until now, Kanban boards were only found in the nerdiest of productivity software (Trello being a famous example.)
But slowly...