Originally called "connected TVs," these sets were later branded as "smart TVs" by companies such as Samsung and LG. The term has come to denote any TV that can be connected to the internet to access streaming media services and that can run entertainment apps, such as on-demand video-rental services, internet music stations and web browsers.

A growing number of models now include voice recognition tools, like Alexa, for switching channels and searching for programs. Premium models are also gaining voice-drive search, which can find shows and movies across streaming apps and live programming from cable or satellite.

Voice control and the integration of smart home features, such as Samsung's SmartThings hub on its sets, mean that many TVs are compatible with other connected devices in the home, including lights, door locks and other sensors.

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