What is fascia? The fascia is the long, straight 'board' that runs along the lower edge of the roof, the eave. It is fixed directly to the roof trusses and supports the gutters and drain pipes.
The fascia also functions as a trim that gives the edge of the roof a clean and even appearance. Fascia boards are quite noticeable, so most homeowners paint them or install vinylor painted metal fascia boards to blend in with the color palette of the rest of the house.
What is soffit? The soffit closes the gap between the wall of the house and the fascia closing the gap between the wall of the house and the fascia. They usually have vents or holes to facilitate airflow inside the attic, which in turn helps keep the roof surface cool.
Most soffits are made from vinyl, an effective material for withstanding the degradation that comes from heat and moisture exposure. This is especially important considering that the soffit can be easily exposed to moisture due to unkempt gutters and wet weather conditions.