Cygwin is a free and open source software platform that provides access to a large collection of tools, utilities, and libraries for Windows. It is a Linux-like environment for Windows that includes a command-line shell, a software development environment, a suite of text-based utilities, and a wide range of applications. With Cygwin, users can access the same tools, libraries, and utilities as on a Linux machine, while still leveraging the benefits of a Windows operating system. Cygwin is a great solution for Windows users who are looking to use Linux-style tools and environments on their computers.