A webtop is a remote implementation of a desktop operating environment that provides similar functionality as that of a local desktop but is accessed using a Web browser.
A webtop is a hosted desktop service technology that allows a virtual desktop interface to be hosted, managed and maintained entirely on the service provider’s infrastructure.
A webtop is also known as virtual desktop or hosted desktop.
Techopedia explains Webtop
A webtop is primarily a cloud service model and is implemented through desktop virtualization by which a virtual desktop interface is emulated on a remote physical server infrastructure. Webtops are installed with a typical operating system such as Windows, Linux or Mac, and get most of their computing power and resources from the remote server that hosts them.
Webtops are usually exact replicas of a local desktop, and provide the same graphical user interface, file creation and sharing. All the data, however, remains on the remote server until it is synchronized with the local machine.