The answer to 'difference between soffit' is that soffits and fascia are both important components of a home's roofing system, but they serve different functions. Soffits are the horizontal panels that run along the underside of the roof overhang, while fascia are the vertical boards that run along the edge of the roof.
Soffits provide ventilation for the attic space, helping to regulate temperature and prevent moisture buildup. They also protect the rafter tails and give the home's exterior a finished, polished look. Fascia, on the other hand, provide a surface for gutters to be attached and help to protect the roof's edge from weather damage.