Fascia, facias, or facia board refers to the board one mounted at the point where the roof meets the house’s outer walls, aka the roofline as some people refer to it.
The soffit board is tucked away under the fascia board. It is usually the board that you see most from street level.
Gutter systems direct rain and melted snow away from your home. The soffit can be ventilated to allow the flow of air into the roof area.