Telephone numbering is a system used to assign unique numbers to telephones, allowing for efficient communication. Each number typically consists of a country code, area code, and a local number. The country code identifies the nation, while the area code designates a specific geographic region within that country. In many countries, the numbering plan is regulated by a governing body, such as the International Telecommunication Union (ITU). This ensures that numbers are allocated fairly and that there are enough numbers available for future growth. The system helps prevent confusion and allows for seamless connectivity between different regions and countries.