zip code

**zip code**

A zip code is a numerical code used by postal services to designate specific geographic areas for efficient mail delivery. In the United States, a ZIP (Zone Improvement Plan) code typically consists of five digits, sometimes extended with an additional four digits for more precise locations. Zip codes help organize locations geographically, streamline mail sorting, and improve delivery accuracy. They are commonly used not only for mailing purposes but also in various applications like demographic analysis, online shopping, and location-based services.