Moons are satelites. A satelite is an object that revolves around an object. The Earth's moon is so named because it revolves around the Earth. So, the moons of a planet are simply bodies of matter that revolve ariund that planet. The Sun is a star.
All stars live and die.
Stars produce massive amounts of heat energy and in so doing they also give off light. The stage of life that a star is in is determined by the colour of light it gives off. The youngest stars are the hottest. They are blue. The youngest stars are the coolest.