The ZIP file format is a data compression and archival format. A ZIP file contains one or more files that have been compressed, to reduce their file size, or stored as-is.
http://en.wikipedia.org/wiki/ZIP_%28file_format%29

Windows data compression utility that focuses on the Zip data compression format for all Windows users. Built-in support for popular Internet file formats such as TAR, gzip ...
http://www.winzip.com/

Look up a ZIP code. ... Find a ZIP Code by entering an address. (You can also search for a partial address, such as "Main Street, Fairfax, VA.")
http://www.usps.com/zip4/

noun . 1. a sudden, brief hissing sound, as of a bullet.
http://dictionary.reference.com/search?q=zip&r=66

Open source Windows utility for manipulating archives. Formats 7z, ZIP, GZIP, BZIP2 and TAR are supported fully, other formats can be unpacked.
http://www.7-zip.org/