A task can be big or small, easy or really hard — but it's never more than a job that needs to get done.
Chop chop! There's a task that needs completing, and you're just the person for the job. If you're smart though, you'll figure out a way to task someone else with it, or assign it elsewhere. Task comes to us all the way from the Latin word taxare, which in its earliest days meant "to impose a tax on." So much like the filling out of your tax forms, most tasks are considered chores.