1. Windows :
Windows is a group of various proprietary graphical operating systems which is provided by Microsoft Incorporation. It is also known as Microsoft Windows. It currently includes Windows NT and Windows IoT as members of its family. Earlier it included Windows 9x, Windows Mobile and Windows Phone which are no longer in use. It is the most used operating system in personal computers. The first version of Windows was launched by Microsoft in 1985. The most recent version of Windows for personal computers is Windows 10.
2. Chrome OS :
Chrome OS is a Linux kernel based operating system which is provided by Google. It uses Google Chrome web browser as main user interface. It was developed using C, C++, Javascript, HTML5, Python and Rust. It is used in personal computers known as Chromebook. The first version of Chrome OS was launched by Google in 2009. Google announced it as an operating system in which both user data and applications reside in the cloud. The latest stable version of Chrome OS is 75.0.3770.102.
Difference between Windows and Chrome OS :