What is a star?

Stars are heavenly bodies, which shine like our sun. Many shine brightly, the others have a dim glow. Some are red while others are blue. Stars are giant balls of gas made of hydrogen, bound together by their own force of gravity. The energy that makes them shine comes from a kind of power plant in their interior, where atomic nuclei of hydrogen atoms are fused together to form helium atoms. 

The stars do not live forever and 'die' at some point. Many simply get extinguished, while very heavy stars expand and explode. Their remains become either a neutron star or a 'black hole'