Wine 2.0 is the most recent version of the popular compatibility layer for operating systems such as Mac OS X, BSD, and for Linux.
What it allows you to do is run — some — Windows programs on those devices. This is excellent for users who switched from using Windows on their machines to Linux or Mac OSX, but want to use certain programs only available for Microsoft Windows.
I ran the excellent KeePass password manager for Windows for instance on Linux back in the days using Wine.
Wine 2.0 is the newest version of the compatibility layer that introduces plenty of