The format was created after Systems Enhancement Associates (SEA) filed a lawsuit against PKWARE claiming that the latter's archiving products, named PKARC, were derivatives of SEA's ARC archiving system. ZIP file format was designed by Phil Katz of PKWARE and Gary Conway of Infinity Design Concepts. When navigating a file system via a user interface, graphical icons representing ZIP files often appear as a document or other object prominently featuring a zipper. ZIP is used as a base file format by many programs, usually under a different name. ZIP and the MIME media type application/zip. ZIP files generally use the file extensions. Most free operating systems have built in support for ZIP in similar manners to Windows and Mac OS X. Apple has included built-in ZIP support in Mac OS X 10.3 (via BOMArchiveHelper, now Archive Utility) and later. Native support was added as of the year 2000 in Windows ME.

Microsoft has included built-in ZIP support (under the name 'compressed folders') in versions of Microsoft Windows since 1998 via the 'Plus! 98' addon for Windows 98.

The ZIP format was then quickly supported by many software utilities other than PKZIP. This format was originally created in 1989 and was first implemented in PKWARE, Inc.'s PKZIP utility, as a replacement for the previous ARC compression format by Thom Henderson. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common. A ZIP file may contain one or more files or directories that may have been compressed. ZIP is an archive file format that supports lossless data compression. ipa, Apk_(file_format) ( EAR, RAR (Java), WAR) You would typically create a PDF if you wanted to ensure document fidelity, to make it more secure, or to create a copy for storage. Creating a PDF can involve compressing a file, making it take up less storage space. They can be viewed on almost all devices. PDF files aren’t typically created from scratch, but are usually converted, saved or ‘printed’ from other documents or images before sharing, publishing online or storing. It is maintained by the International Organisation for Standardization (ISO). The PDF format is now a standard open format that isn’t just available under Adobe Acrobat. The format has evolved to allow for editing and interactive elements like electronic signatures or buttons. It was developed by Adobe so people could share documents regardless of which device, operating system, or software they were using, while preserving the content and formatting. PDF stands for ‘Portable Document Format’ file.

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