Extradition presents a form of co-operation between states. Almost every state with its domestic and international regulations pays specific importance to this kind of cooperation with the only purpose to prevent or fight the prevalent form of criminal offence that involves an international element, which has been present in many countries of the world during the last centuries, respectively in the XIX century. In this paperwork, we will commit ourselves to key regulations required by the European Convention and the additional protocols on Extradition. Herein, some explanation of articles for the extradition request regulations for criminal offence will be provided and analyzed. Then, cases of rejection of extradition, extradition of citizens of the resident state, procedures, and other regulations that applies to this paperwork.