The International Criminal Court (ICC) is the world's first standing international criminal court, and is an independent entity with its own "international legal personality. This chapter talks about the ICC and its structure, jurisdiction, and the issues of admissibility, complementarity and applicable law. An important feature of the international criminal justice system established by the Rome Statute is the obligation of States Parties to cooperate fully in the investigation and prosecution of crimes within the Court's jurisdiction. The chapter also discusses the issues of witness and victim participation. Victim participation typically occurs through a legal representative. Victims are free to choose their legal representative, who must be a person with extensive experience as a criminal lawyer, judge, or prosecutor, and fluent in one of the Court's working languages (English or French). The chapter ends with a review on the pending situations. Keywords:International Criminal Court (ICC); international criminal law; Rome Statute; victim participation; witness