The format "NXX-NXX-XXXX" represents a standard way to write a ten-digit telephone number in the United States. The first part, "NXX," indicates the area code, which consists of three digits, while the second "NXX" represents the local exchange code. The final four digits, "XXXX," identify the specific line or subscriber. This numbering system helps organize and route phone calls efficiently. The area code allows for regional identification, while the local exchange code further narrows down the location. Together, they ensure that calls reach the correct destination within the telecommunications network.