The smart tv provides several features and some of these will require access to internet if you are directly streaming movies and youtube. But there are some features like media player and DNLA wireless connectivity with other compatible devices like smart phones and DVD players that operate without internet. For this you will need a wi-fi or wired Lan connection from TV to your router.
Yes if you want to connect to things like you tube otherwise no the HDTV will run with cable or an antenna
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