European Union's foreign and security policy, which has gradually evolved during the years, enables European Union to speak and act uniformly when global issues are at stake. Joint action of all 28 EU membering countries achieves much greater influence then every country following its' own policy. European Union's foreign and security policy goal is to preserve peace and strengthen international security, to promote international cooperation and to act on strengthening democracy, rule of law and respecting human rights and fundamental freedoms Theoretical part of this work explains how the European Union's foreign and security policy is formed by five most important documents, which are the institutions that work in the realm of foreign policy and which is the key role of each of them - most importantly the role of High representative. In the second part of the work, European security and defence policy is explained (which is the constitutional part of Joint foreign and security policy). Key activities, bodies and important strategic goals of European security and defence policy are defined. An analysis is conducted about the role of small states in the European Union foreign policy and characteristics of Republic of Croatia's foreign policy are shown.