Lighting is the deliberate use of light to achieve a practical or aesthetic effect. Lighting includes the use of both natural light and artificial light sources like lamps and light fixtures, and also includes the use of colored gels. Lighting has been used since the first human homes were built. From the ancient Greeks to medieval castles, people have used lighting in architecture to provide safety, a sense of warmth, and the ability to see. As technology progressed, so did the variety of lighting options, with candles, oil lamps, gas lighting, and eventually electricity becoming available to the public. Nowadays, lighting is used to create and enhance moods or drama in both indoor and outdoor spaces. In the home, lighting can be used in conjunction with home decor to create layers of light. Different types of light sources can provide task lighting, accent lighting, and general lighting. Lighting is also used across a variety of industries, from concerts and performances to retail applications. Staging lighting, used in the entertainment industry, is an important part of the overall atmosphere, and is used to highlight performers and set pieces. Lighting is versatile and can be used in many different ways. It can set the tone for a space, bring attention to a display or artwork, or create a certain mood. Whatever the application, lighting is an important tool for achieving desired results.