Soffits are the boards that cover the underside of your roof overhang. Soffits provide ventilation to your attic, prevent birds and rodents from nesting in your roof and give your home a finished look.
Fascias are the boards that run along the edge of your roof, supporting the lower edge of the tiles and the guttering. Fascias also seal the gap between the roof and the walls, preventing moisture and insects from entering your home.