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, and 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. Lighting technology has evolved from simple torches and candles to a vast array of light sources and fixtures. Modern electric light sources come in a profusion of types, sizes, and colors. Some of the most common include incandescent, fluorescent, halogen, LED, and HID lamps. Specialized lighting fixtures may be mounted or integrated into ceilings, walls, and accessories. A variety of special effect lighting techniques can be incorporated to accentuate architectural features. Smart lighting can be used to dim and brighten lights adjust colors and even control the lighting in different rooms. Lighting can be divided into two categories: general lighting and task lighting. General lighting is used to illuminate a whole room or area, and may be accomplished with ceiling fixtures like recessed lighting, chandeliers, pendants and track lighting. Task lighting focuses on an area in which a task will be performed. Examples of task lighting include desk lamps, reading lamps, under-cabinet lighting and headboards. In conclusion, lighting is an important aspect of home and business design. It can be used to enhance the aesthetics of a space, improve task performance, and even improve the emotional wellbeing of its occupants. With an array of different light sources and fixtures, there are many ways to incorporate lighting into interior and exterior design.