If you have been searching for the term , you are likely looking for a way to run or repair Windows 8.1 without installing it on your hard drive. In the traditional sense, Microsoft never officially released a "Live CD" version of Windows 8.1 (like Ubuntu or other Linux distributions). However, Windows 8.1 does offer a Windows PE (Preinstallation Environment) or a Recovery Drive that functions as a live environment.
A true "Live CD" allows you to run a full operating system entirely from RAM without touching your hard drive. Microsoft does provide a standard Windows 8.1 Live CD for everyday use. Instead, the closest legal alternatives are: Windows 8.1 Live Cd Iso Download