Light is very very important for us light we can use in many ways .
ex;- In home we need light  for  study purpose light is useful. and  in kitchen  to cook  food at night time we need light. and  at night time in street  we need light.
and one more example  how sun is useful us like that only light also very useful to us....
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good example
plz,click yellow button
The natural agent that stimulates sight and makes things expression in someone's eyes indicating a particular emotion or mood.provide with light or lighting; illuminate.make (something) start burning; ignite.having a considerable or sufficient amount of natural light; not dark.(of a colour) pale.