While the name sometimes appears in the forms WINE and wine, the project developers have agreed to standardize on the form Wine. 'Emulation' usually would refer to execution of compiled code intended for one processor (such as x86) by interpreting/recompiling software running on a different processor (such as PowerPC). No code emulation or virtualization occurs when running a Windows application under Wine. There is some confusion caused by an early FAQ using Windows Emulator and other invalid sources that appear after the Wine Project name being set. The selection of 'Wine is Not an Emulator' as the name of the Wine Project was the result of a naming discussion in August 1993 and credited to David Niemi. Wine is predominantly written using black-box testing reverse-engineering, to avoid copyright issues. Wine provides its compatibility layer for Windows runtime system (also called runtime environment) which translates Windows API calls into POSIX API calls, recreating the directory structure of Windows, and providing alternative implementations of Windows system libraries, system services through wineserver and various other components (such as Internet Explorer, the Windows Registry Editor, and msiexec ). Wine also provides a software library, named Winelib, against which developers can compile Windows applications to help port them to Unix-like systems.

Wine (formely a recursive backronym for Wine Is Not an Emulator, now just 'Wine') is a free and open-source compatibility layer that aims to allow application software and computer games developed for Microsoft Windows to run on Unix-like operating systems. ReactOS (for Windows app and driver compatibility).

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