Okay, so you know how sometimes you see a color and you say "that's blue" or "that's green"? Well, there are a lot of different colors and we needed a way to talk about them and show them on a screen or in a picture.
That's where the CIE 1931 color space comes in! It's like a big chart that helps us understand and show all the different colors. Imagine a big square with lots of little squares inside of it. Each little square is a different color.
But when we talk about colors, it's not just about how they look, it's also about how much light they give off. So the chart also helps us measure how much light each color has. This is important for things like TV or computer screens, because we want the colors to look the same no matter what screen you're using!
The CIE 1931 color space is named after the people who made it, and their work helped us understand colors and light better. So next time you see a bright color, you can think of the CIE 1931 color space that helped us understand it!