Okay kiddo, a unique selling point is like having a special power that makes you different from everyone else. When people want to buy something, they usually have a lot of choices, so businesses need to have something special or unique about what they're selling to stand out and attract customers.
For example, if a company is selling shoes, they might have a unique selling point of being really comfortable or having a cool design that other shoes don't have. This special thing sets them apart from all the other shoe companies, and when people want to buy shoes, they might choose this company because they have that special thing that other companies don't.
Just like how you have your own special talents or skills that make you unique, businesses have to find their own special thing that sets them apart from other businesses. That's their unique selling point!