PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format.
PKZIP was first introduced for MS-DOS on the IBM-PC compatible platform in 1989. Since then versions have been released for a number of other architectures and operating systems.
PKZIP was originally written by Phil Katz, and marketed by his company PKWARE, Inc. The "PK" prefix used in both names derives from the author's initials.
