Well, picture your family sitting down to play a board game.
Every country has their own set of laws and each is unique to that country.
For example, in the United States, the law says we drive on the right-hand side of the road. In England, on the other hand, their law states they drive on the left. Well, laws can be made by the national government or by individual state governments. National laws are those laws that everyone in the country must follow. Laws made by individual states are only good in that state.