what are cygwin?
<answer> Cygwin is an open source collection of tools that allows Unix or Linux applications to be compiled and run on a Windows operating system from within a Linux-like interface. <context> Cygwin is an open source collection of tools that allows Unix or Linux applications to be compiled and run on a Windows operating system from within a Linux-like interface. This capability helps developers to migrate applications from Unix or Linux to Windows-based systems, and makes it easier to support their applications running on the Windows platform. Cygwin includes a dynamic link library (DLL) and a collection of tools.