Okay kiddo, have you ever seen those fancy fans that people use to cool themselves down on a hot day? Well, in Japan a long long time ago, people used those fans not just to cool themselves, but to fight in battles too!
These special fans were called war fans, and they were made out of things like bamboo, leather, or metal. They were usually decorated with really cool designs, and sometimes even had sharp edges, so they could be used like a weapon.
The samurai warriors were the ones who really liked using war fans, because they were already skilled in using swords and other weapons, and the fan gave them a sneaky advantage in battle. They could hide the fan behind their back, and then suddenly whip it out to block an enemy's attack or even slash them with the sharp edges.
But war fans weren't just used for fighting. They were also used to communicate messages during battle. Imagine trying to shout instructions to your soldiers across a loud and chaotic battlefield - it would be really hard to hear! So instead, samurais would use different fan movements and signals to tell their buddies what to do.
Nowadays, war fans aren't really used in battles anymore (thank goodness!) but they're still really popular as decorative items and collectables. People love learning about the history and culture of Japan, and war fans are a really cool way to do that.