Planner is a new Productivity Tool which is now delivered with the Office 365 Productivity Platform. Using Planner, you can create new plans, organize tasks, assign tasks, share files, and get updates on the tasks. And much more.
Given below is the snap shot of the Planner hub. On the left, you can see 3 favorite plans and 2 other plans. And you get wonderful visual of the various tasks within the plans.