A Micronation is a small area or political entity that claims national sovereignty but is not recognized by other sovereign states.
There are different types of Micronations. Though they all fall under one of two categories.
Simulation.
Serious.
Simulation: A simulated Micronation can be a project made for fun example A country with its own flag and constitution but the country doesn't have any physical land. The country could be a website or even a minecraft server and is a great way to learn about Diplomacy economics and other various things.
Serious: A serious Micronation is a Micronation that wants to succeed from whatever country they are already apart of. It could also be a man made artificial Island in international waters either way a serious Micronation wants to be recognized as a sovereign state