Wine was originally an acronym for "Wine Is Not an Emulator" however it in most cases is referred to a Windows emulation tool on Linux. In most cases within a server environment the installation and use of WINE is not needed however some server software will only run within a Windows environment WINE will give that compatibility layer to accomplish that.
How do I install WINE?
Well most Linux distributions have WINE within the package management tool such as yum and apt
Install on Ubuntu/Debian
apt-get install wine
Install on CentOS
yum install wine
Wine also has Binary and packages available for download from here