The answer to 'what is roof' is a roof is the uppermost part of a building's structure that provides protection from the elements, such as rain, snow, and sunlight. It is typically made of materials like asphalt shingles, metal, or tiles, and its primary function is to keep the interior of the building dry and insulated.
Roofs come in various shapes and designs, including flat, pitched, gabled, and hipped, depending on the architectural style of the building and the local climate. The roof's structure, which includes the framing, trusses, and sheathing, is essential for its stability and longevity. Regular maintenance and repairs are necessary to ensure the roof's effectiveness and prevent costly damage to the building.