What is Cygwin?

What is Cygwin?

A.
Cygwin is a free C++ compiler that runs on Windows

B.
Cygwin is a free Unix subsystem that runs on top of Windows

C.
Cygwin is a free Windows subsystem that runs on top of Linux

D.
Cygwin is a X Windows GUI subsytem that runs on top of Linux GNOME environment

Explanation:
Cygwin is a Linux-like environment for Windows. It consists of two parts:
A DLL (cygwin1.dll) which acts as a Linux API emulation layer providing substantial LinuxAPI
functionality

A collection of tools which provide Linux look and feel
The Cygwin DLL works with all non-beta,non “release candidate”,ix86 32 bit versions of Windows
since Windows 95,with the exception of Windows CE.