HbbTV and DVB-I are both 'service layer' specifications, but they have different functions and are complementary solutions. DVB-I covers the signalling of services available over the internet – possibly combined with terrestrial, cable and/or satellite services – and the delivery of those services, while HbbTV rather enables applications to be provided to the user, via broadcast and/or IP as part of a television service. DVB-I and HbbTV can work together in various ways. A DVB-I service list can include both broadcast and DVB-DASH broadband services that have an associated HbbTV ‘red button’ application. Furthermore, a DVB-I service list can include services that are themselves an HbbTV app, where the app takes the responsibility for presenting the video and audio. It is also possible to implement a DVB-I receiver as an HbbTV application. And since HbbTV is already widely used in the market, and it can be an enabler for DVB-I deployments.