Lighting is the use of light to achieve a practical or aesthetic effect. Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight. Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings. This can save energy in place of using artificial lighting, which represents a major component of energy consumption in buildings. Proper lighting can enhance task performance, improve the appearance of an area, or have positive psychological effects on occupants. Indoor lighting is usually accomplished using light fixtures, and is a key part of interior design. Lighting can also be an intrinsic component of landscape projects. With the discovery of fire, the earliest form of lighting used was a natural authority. Sunlight has been used by humans since the dawn of time and still is used in some areas today. In fact, the indirect sunlight that enters through windows is one of the parameters used in the calculation of daylighting. In modern times, electric lighting has become increasingly popular as a way to create a desirable atmosphere in a space. With the invention of the light bulb in the 19th century, electric lighting has become available and is now being used in many commercial, residential, and industrial spaces. Electric lighting can come in a variety of forms, such as incandescent, fluorescent, LED, halogen, and others. Whether used to create a desired atmosphere or to brighten up a workspace, proper lighting is key. Different applications may require different types of lighting, and a wide range of materials are available to fit any need. With the advances in technology, many forms of energy efficient lighting are also available on the market. Light and lighting will continue to play an important role in many aspects of life.