So when you're looking at a screen, like on your computer or phone, it's really just a bunch of tiny lights that are turning on and off really quickly. Sometimes, when these lights aren't turning on and off at the same rate, it can create a flickering effect. It's kind of like when you turn a light switch on and off really fast - it can look like the light is flickering. Flickering can be annoying for some people and can even make them feel sick or dizzy. Thankfully, there are ways to adjust the screen settings to reduce flickering and make it more comfortable to look at!