Display contrast is how much difference there is between the light and dark parts on a screen or monitor. Think of it like when you color with crayons - if you color very light, you can't see it very well, but if you color very dark, it is very easy to see. The contrast on a screen is important because it helps us see what is on the screen more clearly. If the contrast is too low, things might look blurry or hard to see, but if it is too high, things might look too bright and hurt your eyes. So, it's important to have the right amount of contrast so that everything is easy to see and doesn't hurt your eyes.