The Japanese yen is a type of money that the people in Japan use to buy things that they need or want. It's like how you might use money to buy candy or toys.
The yen is a special type of money because it comes from the country of Japan. Just like how different countries might have different names for their money, Japan has their own name for their money which is yen.
People who use yen might get it from a bank, just like how you might get your allowance from your parents. They can use yen to buy things at stores or online or even to travel to different places.
Sometimes the value of the yen might be different compared to other types of money like US dollars or euros. This means that one yen might be worth more or less than one dollar or one euro.
Overall, the Japanese yen is just a type of money that people use in Japan to buy things they need or want.