I WONDER - Is Light White?

The video explains that light is composed of all colors combined to form white light. This white light can be split into individual colors: red, orange, yellow, green, blue, indigo, and violet. A prism is used to separate white light into these colors. Isaac Newton discovered that light is made up of various colors, which can be observed when white light is dispersed.

What is a prism and what does it do?

Who discovered that light is made up of different colors?