A more thorough explanation:

International offense, also known as international crime, refers to a serious violation of international law that is punishable by law. This includes crimes such as genocide and crimes against humanity, which are considered to be the most severe offenses against humanity.

An international crime is considered to have occurred when three conditions are met:

1. The criminal norm must come from a treaty or customary international law and must have direct binding force on individuals without intermediate provisions of municipal law.
2. The provision must be made for the prosecution of acts penalized by international law in accordance with the principle of universal jurisdiction.
3. A treaty establishing liability for the act must bind the great majority of countries.

For example, the International Criminal Court (ICC) was established to prosecute individuals for international crimes such as genocide, war crimes, and crimes against humanity. The ICC has jurisdiction over individuals from countries that have ratified the Rome Statute, which is a treaty that establishes the ICC's authority.

Another example of an international offense is piracy, which is a crime under international law. Piracy is defined as any illegal act of violence or detention or any act of depredation committed for private ends by the crew or passengers of a private ship or aircraft on the high seas or in a place outside the jurisdiction of any state.

These examples illustrate how international offenses are serious crimes that are punishable by law and can be prosecuted by international courts.