: Version 2.04c introduced the Deflate compression method, which remains the backbone of how most ZIP files—and even modern web pages—are compressed today. Core Functions
PKZIP is a classic data compression software developed by Phil Katz and his company, PKWARE, Inc. , which essentially created the ZIP file format that became the industry standard. Pkizip
While once a command-line tool for DOS, PKZIP evolved into a sophisticated suite for modern operating systems including Windows, UNIX, and mainframes. : Version 2
: Used to extract or unpack those files back to their original state. Modern Usage & Security Pkizip
: Every ZIP file contains a unique "record separator" marked with the initials "PK" as a tribute to Phil Katz.