A task can represent a new feature request, a sales lead, an idea etc. Tasks are stored in columns on Boards called Lists. Tasks can be moved between Lists to indicate progress or change in status.
You can make people responsible for a task by simply dragging and dropping their Profile Photos onto the task.You can also Track Time, Log Hours, Add Attachments and ...more on a Task
To add a task to a List click the Add Task option at the bottom of the List