What i the difference between an emission nebula and a reflection nebula

In these nebulae, stars are formed by gaseous material coming together. Ultraviolet radiation emits from the smaller stars and this is the reason why the nebula looks very bright.

Reflection nebulae mostly get the light that they receive from stars that are close by. This is exactly how the moon reflects light from the sun. The nebulae do not have enough stored energy so reflection is the cause of this.