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Cygwin is a free, open-source compatibility layer for Windows that provides a large collection of GNU and open-source tools offering functionality similar to a Linux distribution. It includes a POSIX API emulation layer (cygwin1.dll) enabling programs that rely on Unix/POSIX system calls to compile and run on Windows without modification. Cygwin supports bash shells, core utilities, package management, and popular development tools, making it a bridge for developers transitioning between Unix and Windows environments.