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, with both of them bearing his initials: 'PK'.