Lol, well I will not assume that you are a 5-year-old nor assume that you want to teach your 5-year-old kid about blockchain as they are too occupied with all those flashy games nowadays.
But I understand your concern. here is an educational video that Andreas made explaining crypto to a non-technical person.
If he couldn't simplify it enough nobody can.
https://www.youtube.com/watch?v=1wDwb36GNxw