In the meantime, the law of the European Union (EU) has reached a considerable compass and influences the national laws to a significant extent. This manual at hand shall explain the fundamentals of EU law in a short and precise way by means of some noteworthy examples. The most important aspects of the EU shall be presented in a clear and easily comprehensible way, such as the EU institutions and their role in the decision-making process. Apart from the principles of EU law, and the fundamental freedoms of the EU internal market, the last chapter demonstrates how the documents mentioned in this manual can easily be accessed on the websites of the EU etc.