Skylight is like a horizontal window or opening place in the roof to admit natural daylight or to give a clear vision of the sky at night. Materials used for admitting light or to provide vision can be glass or acrylic sheets depending upon the project requirements framing members supporting such type of materials can be either aluminium profiles or steel framing suitably treated to avoid corrosion.
The dome shape of the skylight prevents sitting water on the surface of the skylight. For larger openings, glass skylights require the glass to be thicker and specially laminated, however, dome units stay cost effective and relatively lightweight. These domes rest adjacent on a flat roof.