Final answer:
Extraterritoriality is the extension of a country's laws over its citizens outside its sovereign national boundaries. It allows a country to exercise jurisdiction over its citizens even when they are in another country.
Step-by-step explanation:
Extraterritoriality is the extension of a country's laws over its citizens outside its sovereign national boundaries. It is a concept in international law that allows a country to exercise jurisdiction over its citizens even when they are in another country. For example, when a citizen of Country A commits a crime in Country B, Country A can request their extradition or trial them in their own courts based on extraterritorial jurisdiction.