Write a descriptive sentence using the given noun.
Rainbow
A rainbow is a beautiful display of colors in the sky formed by the reflection, refraction, and dispersion of light in water droplets.
Complete the following task based on the instruction and optional input provided.### Instruction:
Write a descriptive sentence using the given noun.

### Input:
Rainbow

### Output:
A rainbow is a beautiful display of colors in the sky formed by the reflection, refraction, and dispersion of light in water droplets.