The current project represents a theoretical piece of work describing the main concepts regarding the European Union and its most important institutes and bodies. It gives the brief characteristic to the Union itself stating that the activities of all the related areas are conducted through its institutions and bodies that have been established along with the establishing of the EU itself and through different stages of its development. Afterwards, the paper gives a profound and exhaustive description towards the history, the current state, the working process and the structure of each of the significant and influential institutions and bodies of the European Union. The paper states that the activities of these institutions and bodies are devoted to follow and implement the interests of the European Union citizens, residents and companies in the most effective manner. Moreover, it is concluded that the success of EU lies within the effective work of its institutions