There’s a subtle difference.
Contractors are supposed to be relatively independent. You give them the outcome (a new deck), a deadline (June 1st), and any stipulations (no work after 9pm) and they organize the work however they see fit. One guy could work steadily for two weeks, or a bunch of staff could show up and knock out the deck in two days.
Employees are supposed to take more direction. You can tell an employee that she must start at 8am each day. She will dig holes for the footings on the north and west sides first, then start cutting stringers while the other guy finishes the south and east sides.