What are edge cases?

Edge cases are special situations that happen when things go just a little bit different than usual.

Imagine you're playing with building blocks. Most of the time, you stack them neatly and they stay up. But sometimes, if you put a block on top of another one at a weird angle, it might fall over, even though both blocks are normal.

That's like an edge case. It’s not something that happens all the time, but it shows how things can behave in unexpected ways when conditions change just a little.

Think about eating cereal. Usually, you pour milk into your bowl and mix it up. But what if there's no milk? That's like an edge case too, the cereal might be dry and crumbly instead of soft and tasty.

Or imagine you're riding your bike. Most days, the wheels roll smoothly. But what if one wheel is flat? Suddenly, riding becomes harder, that’s another edge case, a little change making a big difference in how things work.