Edge case

Imagine you and your friends are playing a game where you have to get from one side of the room to the other without touching the floor. You all try jumping from one piece of furniture to the next, but there's one problem: one of your friends can't jump as far as everyone else, so they can't reach the next piece of furniture. This is an edge case - a situation that's a little different or harder to deal with than the usual situation. It's often something that most people don't think about, but can make a big difference for someone who's affected by it. In computer programming, an edge case is a scenario that's not part of the normal routine, but still needs to be accounted for in case it happens.