What tool splits light into color and why is this usefull?

A prism is a tool that splits light into its constituent colors through a process called refraction. When light passes through the prism, different wavelengths are bent by varying amounts, resulting in the spectrum of colors known as a rainbow. This is useful in various applications such as spectroscopy, where it helps scientists analyze the composition of light from different sources, and in educational settings to demonstrate the properties of light.