Color depth is like a box of crayons. When you only have a few crayons, you can only color a few things. But when you have a lot of crayons, you can color a lot more things because you have more colors to choose from.
Color depth is how many different colors a computer or a screen can show. It's like how many crayons your computer or screen has. If your computer has a low color depth, it can only show a few colors, just like if you only have a few crayons. But if your computer has a high color depth, it can show a lot more colors, just like if you have a lot of crayons.
A computer or screen with a high color depth can show more details and make pictures and videos look much better. So, it's better to have a computer or screen with a high color depth if you want things to look really good.