Why must you cool cake before wrap it?

* Prevents condensation: A warm cake will release moisture into the air, creating condensation inside the wrapping. This can make the cake soggy, especially if it's wrapped in plastic.

* Maintains texture: As the cake cools, it firms up and sets. Wrapping a warm cake can trap the heat and prevent it from fully setting, leading to a crumbly or uneven texture.

* Preserves freshness: Cooling the cake allows it to fully dry out, which helps to prevent mold growth and extends its shelf life.

* Easier to handle: A warm cake is more fragile and can easily break apart when handled. Cooling it allows it to solidify, making it easier to wrap and transport.

* Better flavor: Some cakes, like sponge cakes, are best enjoyed after they've had time to cool and settle, allowing the flavors to fully develop.

In short, cooling a cake before wrapping it ensures a better texture, appearance, and longevity, making it more enjoyable to eat.