Okay kiddo, so the national broadband plan is like a really big plan for the whole country to make sure everyone has access to the internet.
The internet is like a giant library that has all kinds of books and things to learn about, but instead of going to the library, you use a computer or a phone to get on the internet.
Some people live in areas that are really far away from the library (internet) and they can't get there easily. That's kinda like some people can't get on the internet easily because they don't have the right stuff to do it.
The national broadband plan wants to make sure that everyone, no matter where they live, can get on the internet easily. They have a bunch of ideas on how to make that happen like building more internet towers or running wires under the ground.
Just like how your parents might make a plan to make sure you have enough food to eat or toys to play with, the government is making a plan to make sure everyone can use the internet.