Lighting, or illumination, is the deliberate use of light to achieve specific effects. Lighting has been used for centuries to improve visibility, create an atmosphere or mood, affect safety and security, or simply provide beauty. Lighting is obviously an important aspect of both the physical and psychological impact of a space. In recent years, the use of lighting has been revolutionized, both with advances in technology and an increased awareness of how lighting affects us. In the home, different types of lighting can be used to create a mood. Lounges may be lit by floor and table lamps, making them ideal for conversation and relaxation. While bedrooms may be lit using softer lights for a calming atmosphere. In commercial settings, lighting is also used to create atmosphere. Modern design techniques have used specially-placed lighting to make environments warm and inviting to customers. Other commercial settings may employ low lighting to increase security and keep criminals away, or bright lights to make staff and others aware of their surroundings. Finally, it is important to remember the safety aspect of lighting. We may need bright lighting in certain areas to prevent accidents from happening. This is particularly true in places such as stairwells, kitchens and other high-activity areas. In conclusion, lighting is as much an art as a science. It can be used to create beauty, a sense of security, safety and much more. With modern lighting technology, the possibilities are endless and the right lighting can completely transform any space.