Definition PKZIP: Phil Katz's ZIP
Explanation: Phil Katz's ZIP (PKZIP) program is an archiving tool originally written by the late Phil Katz, and marketed by his company PKWARE, Inc. The first version of PKZIP appeared in 1989. It was a DOS command-line tool and was distributed as shareware.
Other definitions in programming such as PKZIP: Phil Katz's ZIP in Dictionary P.