Human history is full of contradictions, antagonisms and murderous conflicts. This history has been built, and continues to be built, on the cement of horror and terror. It is written day by day with the anchor of blood, under the pen of violence. This violence, which poisons human existence, is omnipresent and protean, taking on new forms that threaten international peace and security. These threats include the proliferation of nuclear weapons, prostitution networks, the mafia, cybercrime, piracy and terrorism. Terrorism, one of the world's most widespread forms of violence, has survived the test of time, leaving an indelible mark on human history. In contemporary history, wars and murderous conflicts such as the two World Wars, the Rwandan genocide and the Srebrenica massacre have left their mark on contemporary international relations.