Lighting, or illumination, is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both natural and artificial sources of light, and may be motivated by a functional, non-aesthetic, or both reasons. The practice of lighting has been around since the discovery of fire. Natural lighting, or daylight, provides the main source of light during the day. Artificial lighting, such as lamps, candles, and electric lightbulbs, is often used at night to extend the daylight hours. Lighting can also be used for decorative and aesthetic purposes, such as to set a mood or create a particular atmosphere. In addition, lighting is used to emphasize certain elements in a scene, such as projectors or stage lights used in a theater. Lighting can also be used for utilitarian reasons. Industrial and commercial buildings are typically lit with brighter, more colorful lighting fixtures to ensure the safety of people and contents inside. Streetlights are often used to light the way for people at night. In addition, lighting can help to improve the visibility of traffic signs and even alert people of danger. For health benefits, a good lighting system can set the mood, reduce stress, and increase productivity. For example, natural light streaming in through windows can help elevate mood and energy levels, while dimmer, warmer lights can help encourage sleep. In conclusion, lighting can play a vital role in our daily lives, helping to improve safety, productivity, and the beauty of our environments.