Lighting plays a vital role in the lives of human beings. It illuminates our world, providing us with enough light to see our environment, and allowing us to go about our daily lives. To fully understand lighting, one must consider a few basic concepts. The first is natural light, or the light that comes from the Earths surface, such as the sun or moon. This is the source of most natural lighting, but it can also come from the reflection of light off the atmosphere, clouds, or bodies of water. Natural light plays an important role in photosynthesis and affects our circadian rhythms. The second concept is artificial lighting, or man-made lighting. This includes man-made sources of light such as electric lights, LEDs, and other lighting fixtures. Artificial lighting is also used for specific purposes, such as to provide illumination for working environments or to create a specific mood. Finally, there is the concept of lighting design. Lighting design involves the careful arrangement of lighting fixtures and sources of light to create a desired effect or to meet specific needs. Lighting designers must take into consideration factors such as color, brightness, angle of light, and shadow. Light has many uses and is a basic requirement for any environment. It is important to be aware of the types of lighting we use and how they can be used to our advantage in different situations.