Okay kiddo, so imagine you have a special coupon that your mom gives you before you go to the toy store. This coupon is called a voucher. It's like magic money that you can use to buy toys.
Say you have a voucher for $10. When you go to the store, you can use it to get $10 off the price of any toy you want. It's like getting a discount.
But sometimes vouchers can be used for specific things, like a voucher for a free ice cream cone at a certain store. So you have to read the voucher carefully to know what it can be used for.
Basically, a voucher is a special piece of paper that lets you get something for less money or for free. And who doesn't like getting things for less money or for free, right, kiddo?