Doubanjiang is a sauce that comes from China. It is made from a type of bean called "douban" and some other things like spices.
Imagine you have a big plate of cooked food. The doubanjiang sauce is like a special topping you can put on your food to make it taste really good! It is a little bit salty and spicy, but don't worry, it's not too spicy for your tongue.
When people in China cook food like stir-fry dishes, they might use doubanjiang to add some flavor to the dish. It's like adding some salt and pepper to your food, but instead it's the red and flavorful doubanjiang sauce.
Some people even make their own doubanjiang sauce at home, using special recipes passed down from their families!