A skylight is a special “light-transmitting fenestration,” or a part of the roof of a building, used to convey plentiful sunlight and top lighting, offering a connection between the occupants and the outdoor environment. These are often used to allow fresh air from outside to enter the space below. There are different types of skylights available in the market today, but the standard fixed-unit skylight comprise of a structural perimeter frame that supports a light transmitting panel with glazing infill, which is generally made from plastic or glass. On the other hand, a venting skylight has a glazed sash attached to it, which is supported by the structural frame. Often, these are termed as roof windows, when easily accessible to the occupants. Skylights are popularly used in commercial and residential buildings for day-lighting designs, with the focus of using lesser artificial lights and saving great amount of energy, with lower environmental and financial costs. On the basis of unit area, these are the most effective sources of abundant daylight, and facilitate need of lesser square feet for glazing. There are different types of skylights available in the market today, with a wide variety of infill choices. The installation process will vary with each variety of skylights.