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Anyone shopping for a new set over the past year is likely to have encountered the term “Smart TV.” But what is a Smart TV? And why exactly should you want one? These are relevant questions because Smart TV is the latest marketing juggernaut to hit premium sets. Unless you make an effort to learn about Smart TV, there’s a chance you’ll end up paying for features that you don’t want or need. At the most basic level, a Smart TV is one that can connect to the Internet over a wired or wireless home network and provides a menu of apps to stream video, audio, and data from services like Netflix, Amazon Instant Video, Pandora, Skype, AccuWeather, Flickr, etc. The DLNA capability of these sets also lets you access videos, music, and photos on the TV from your...