PKZIP

PKWAREPKSFX Self-Extract Utility Version 2.04gZIP
PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format.wikipedia
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Zip (file format)

ZIPZIP file.zip
PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format.
This format was originally created in 1989 and released to the public domain on February 14, 1989 by Phil Katz, and was first implemented in PKWARE, Inc.'s PKZIP utility, as a replacement for the previous ARC compression format by Thom Henderson.

Phil Katz

PKZIP was originally written by Phil Katz and marketed by his company PKWARE, Inc, with both of them bearing his initials: 'PK'.
Phillip Walter Katz (November 3, 1962 – April 14, 2000) was a computer programmer best known as the co-creator of the Zip file format for data compression, and the author of PKZIP, a program for creating zip files that ran under DOS.

PKWare

PKWARE, Inc.PKWARE, Inc
PKZIP was originally written by Phil Katz and marketed by his company PKWARE, Inc, with both of them bearing his initials: 'PK'.
He released his own compression program, which he called PKZIP, in 1989.

ARJ

Robert K. Jung
Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. (SEA), Rahul Dhesi's ZOO, Dean W. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for "Archived by Robert Jung".
ARJ was one of two mainstream archivers for DOS and Windows during the early and mid-1990s, with PKZIP being its competition.

DEFLATE

deflateddeflate-decodeDeflate64
It was designed by Phil Katz, for version 2 of his PKZIP archiving tool.

Bulletin board system

BBSbulletin board systemsBBSes
Led by BBS sysops who refused to accept or offer files compressed as .ARC files, users began recompressing any old archives that were currently stored in .ARC format into .ZIP files.
A notable example was Phil Katz's PKARC (and later PKZIP, using the same ".zip" algorithm that WinZip and other popular archivers now use); also other concepts of software distribution like freeware, postcardware like JPEGview and donationware like Red Ryder for the Macintosh first appeared on BBS sites.

DOS

COM1AUX:LPT1
The first version was released in 1989, as a DOS command-line tool, distributed under shareware model with a US$25 registration fee (US$47 with manual).

File archiver

archivearchivingarchive file
PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format.

Computer program

programprogramscomputer programs
PKZIP is a file archiving computer program, notable for introducing the popular ZIP file format.

MS-DOS

DOSMS-DOS 5.0MS-DOS 6.0
PKZIP was first introduced for MS-DOS on the IBM-PC compatible platform in 1989.

IBM PC compatible

PCPC compatibleIBM PC compatibles
PKZIP was first introduced for MS-DOS on the IBM-PC compatible platform in 1989.

List of Unix commands

Unix commandUnix commandsUnix utilities
They include the Unix utilities ar, shar, and tar.

Tar (computing)

tartarballtarballs
They include the Unix utilities ar, shar, and tar.

Compress

uncompress.ZZ
These archives could optionally be passed through a stream compressor utility, such as compress and others.

ARC (file format)

ARC.arcARC file format
Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. (SEA), Rahul Dhesi's ZOO, Dean W. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for "Archived by Robert Jung".

Zoo (file format)

ZOO
Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. (SEA), Rahul Dhesi's ZOO, Dean W. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for "Archived by Robert Jung".

LHA (file format)

LHALZHLHA/LZH
Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. (SEA), Rahul Dhesi's ZOO, Dean W. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for "Archived by Robert Jung".

Sysop

system operatorsysopsadministrators
Led by BBS sysops who refused to accept or offer files compressed as .ARC files, users began recompressing any old archives that were currently stored in .ARC format into .ZIP files.

Shareware

Trialwaredemowaretrial version
The first version was released in 1989, as a DOS command-line tool, distributed under shareware model with a US$25 registration fee (US$47 with manual).

MAPI

Messaging Application Programming InterfaceMAPI/RPCmessaging API