The name "zip" (meaning "move at high speed") was suggested by Katz's friend, Robert Mahoney. ZIP File Format Specification has its own version number, which does not necessarily correspond to the version numbers for the PKZIP tool, especially with PKZIP 6 or later.They wanted to imply that their product would be faster than ARC and other compression formats of the time. ZIP File Format Specification was first published as part of PKZIP 0.9 package under the file APPNOTE. At various times, PKWARE has added preliminary features that allow PKZIP products to extract archives using advanced features, but PKZIP products that create such archives are not made available until the next major release.
ZIP files generally use the file extensions ZIP is used as a base file format by many programs, usually under a different name.
When navigating a file system via a user interface, graphical icons representing ZIP files often appear as a document or other object prominently featuring a zipper.
and Gary Conway of IDC (Infinity Design Concepts, Inc).
A ZIP file may contain one or more files or directories that may have been compressed.
The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common.