The European Union is an economic and political partnership between 27 European countries that has delivered peace, stability, and prosperity over the past 50 years. As members work together, they have more money, people, land area, and are a more powerful economic force. Key aspects of the EU include free trade without tariffs between members, citizens' ability to freely move and work throughout member nations, and use of a common currency, the euro, to make trade easier. Some countries like Turkey, Switzerland, Iceland, and Russia have chosen not to join the EU due to concerns about cultural issues, economic independence, and regulatory control over important industries like fishing.