A Micronation is an entity created by a person in which he/she/they "rules" over, but is unrecognized by the United Nations or any other international organization. It can have all sorts of government systems and ideologies. Examples of this include Molossia, Sealand, and newly created micronations such as the Illinois Free Republic and the Vancouver Island SSR. Many micronations are created every year. They usually thrive on social media sources such as Twitter and Discord and much more. Similar projects created by hate groups are often not recognized as micronations due to public opinion on their ideologies.
If you're thinking "micronations are going rule the world one day", here is what Micronations actually value:
Diversity among all ideologies, except for those that want to do harm to mankind. We do not "invade" other micronations or have plans to overthrow actual governments. We are a community that values everyone and does not discriminate based on race, ethnicity, sexuality, gender, orientation, religion, etc. You can choose your own flag, coat of arms, etc and make it your own. It's up to you!
Micronations AREN'T terrorist organizations or states.