Democracy simulates political environments in simple gameplay. You choose a country you want to manage. And you have 4 years to increase your popularity before the next election. In the next election, if most people vote for you, you'll regain control of your office.
There're many aspects to consider when managing a country. New problems occur every turn. New policies must be implemented to deal with problems. Policies you can use including tax rate, subsidies, import tariff, social policies, etc. Some policy that you implemented may satisfy some group of people, but other people may dislike it.
This game is really useful at teaching about how hard it is to run a country. It's also informative for anyone who wants to understand some basics of politics.