A task represents a project or work item that is either ongoing or that must be completed in a given time frame.
You can adjust the completion percentage of a task as you work on it. Use the arrows to update the Completed value. You can also specify the date when you completed a particular task by selecting the Completion date check box and entering the date. Selecting this check box will automatically update the Completed value to 100%.
Depending on the access rights you set, your tasks can be viewed by other users. See Setting viewing rights for your tasks for more information.