Okay kiddo, so imagine Finland is like a big house with many rooms, and each room is called a province or region. In charge of each of these rooms we have someone called a provincial governor, who is kind of like a house manager.
These governors are responsible for taking care of their room and making sure everything is running smoothly. They work closely with the people who live in their room, called the residents, to help solve any problems that might come up and make sure everyone is happy and safe.
Just like how we have rules in our own house, the governors also have rules that they need to follow. These rules are made by the national government of Finland and are called laws. The governors need to make sure that everyone in their room follows these laws and if someone doesn't, they might get in trouble with the national government.
So basically, these provincial governors are important people who help make sure that everyone in Finland gets what they need and that everyone follows the rules.