Which operating system is primarily web-based and relies on cloud connectivity?

Chrome OS is primarily designed to be a web-based operating system that relies significantly on cloud connectivity. It is optimized for use with web applications and services, with the primary user experience revolving around the Chrome web browser. This design allows users to access applications and storage directly from the cloud, making it lightweight and fast, as most tasks are executed online rather than relying on local processing power or storage.

In comparison, Windows, macOS, and Linux are traditional operating systems that support a wide range of software applications that can be installed and run locally. Although these operating systems can also facilitate web browsing and cloud applications, they are not exclusively web-based and do not prioritize cloud connectivity to the extent that Chrome OS does. Chrome OS's reliance on the cloud is one of its defining characteristics, making it an ideal choice for users who primarily work online and use web applications.