Imagine your mom makes a really delicious cake, and she wants to sell it to other people, but she doesn't want to put her own name on it. So, she lets someone else put their name on the cake, and then they sell it as if they made it themselves. That's called a white label product.
Basically, a white label product is something that someone else has made, but they don't put their name on it. Instead, they let someone else put their own name on it and sell it as if they made it. It's kind of like a secret cake recipe that your mom doesn't want anyone else to know about.