An International Calling Code is a numerical prefix used to dial telephone numbers in different countries. Each country has its own unique code, which is necessary for making international calls. For example, the code for the United States is +1, while India has the code +91. These codes help telephone networks route calls to the correct destination. When making an international call, you typically start by dialing your country's exit code, followed by the international calling code of the destination country, and then the local phone number. This system ensures that calls are properly connected across global networks.