It’s just what it sounds like. Many HDTVs are now equipped with a built in RJ45 (ethernet) input and/or WiFi (built in, or optional) to enable the HDTV to connect directly to the internet. They don’t provide the same access as a computer with a web browser; but they do offer features like Yahoo! widgets for instant access to news, sports scores, weather, stock quotes and more. Many can connect to YouTube or other video sites via picture sharing services like Flickr, and social networking sites likes Twitter or Facebook. Video on-demand services such as NetFlix, HULU, or Amazon On-Demand, are also available. Different television manufacturers have different licensing deals, so check to see if the TV can connect to these apps. Like 120H, manufacturers have their own names for this service, but the features are going to be Similar.