Light is responsible for keeping you alive. If plants didn't make energy from sunlight, you'd have nothing to eat because everything depends on plants for their energy - the beef and chicken and fish you eat have all eaten plants so you'd starve if there was no light for plants to make energy from.
You also use light in many other ways - seeing is a big one. People use artificial lights to be able to see after the sun goes down, which allows us to work longer hours and enjoy entertainment that would not be possible without light.
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If you mean an artificial source of natural light, this would be a light designed to give the correct balance between different light colors, so that objects seen in that light would look the same colors as they do under normal natural daylight.
All the energy you would have used using artificial light when natural light was available and appropriate.
Torch light is NOT a natural source of light. It is an Artificial Source of light generated by the electrical energy. In this the electrical energy is being transformed into Light energy.
If you mean lighting inside a house then no. Natural light is the sun
It's something that emits its own light, and not just reflects it. An example of a natural source would be a star whereas the moon is not, even though it glows. The moon's light is due to reflection. Fast moving and highly charged ionic particle also can emit their own light, or something that has electrons which go from a higher energy state to a lower energy state, even though that light isn't always visible.
yes
Fire is a good example of NATURAL light