Pete Goodall, product manager at Canonical, explained that WebApps is a set of technologies that are being integrated into Ubuntu, one of the leading Linux distributions, to facilitate a native desktop experience. For example, the widely-used Gmail email client can be a WebApp, providing integrated desktop notification and easier startups.
The WebApps system is also integrated with the Ubuntu HUD system or (Heads Up Display), which enables users to perform application activities across the desktop though a simple command interface. In the Gmail example, simply typing “compose email” with WebApps will pull up the Gmail interface ready to compose a new email.
From the Web application side, there is an integration script that that website needs to add. When Ubuntu users visit an application site that has that script, they will be prompted to install the WebApp.