There different sources of light in universe. It can be classified in 2 ways : 1. Artificial Source - They are also called man made source of light (Ex : Candle, Light, Lantern). Here some form of energy is given to them to produce light. Like in bulb we give electric energy to get light energy. 2. Natural Source - These sources produces light naturally (Ex : Sun light). Here no external energy is required to produce light. Some examples of both the sources are shown in figures.