Lighting refers to the use of artificial light sources like free electric lamps and other light fixtures to make areas or objects visible. It is also used to create a certain atmosphere, and provide safety at night or in dark places. Indoor lighting plays an important role in a comfortable living environment. It can create a cozy and warm atmosphere. For example, using soft and warm light fixtures can make people feel relaxed. It also helps people focus on their work and studies, because it can provide enough light source. Outdoor lighting is important for both safety and decoration. Street lights can keep people safe at night and make the view of the street more beautiful. Solar powered lamps are the most environment-friendly choice, as they do not require electric energy and cost less to maintain. In addition, outdoor lamps can also be used to decorate buildings and gardens, or create atmosphere for festivals or activities. Nowadays, more and more people are paying attention to lighting design. Different lighting fixtures can be used to make rooms or spaces look different. They can also help reduce energy consumption and protect the environment. With the development of science and technology, modern lighting is gradually becoming more and more intelligent and energy efficient. To summarize, lighting is important for both indoor and outdoor purposes, and it has become an important part of interior and exterior design. It can not only make spaces look cozy and inviting, but also provide enough light source for activities, and reduce energy consumption.