RGB stands for Red, Green, and Blue, which are the primary colors used to make most of the colors we see on electronic screens like TVs, phones or computers. Think of them as the three main parts that come together to make up colors on your screen.
Red, green, and blue each have a value from 0 to 255, which tells your computer how much of each color should be used to create the final color. For example, if you want to display the color yellow on your screen, you would combine red and green to get a value of 255 for each, and set the blue value to 0.
By mixing different values of red, green, and blue, you can create all the colors you see on your screen. For instance, mixing the maximum value of red and blue, and no green, will make purple. Mixing the maximum value of red and green, and no blue, will make yellow.
So, the RGB color model is a way to create all the colors you see on a screen using only three primary colors - red, green, and blue - and their various combinations of values.