A:Answer A Smart TV connects to the internet and has built-in apps you can access like Netflix, YouTube or Pandora. You can also download new apps on some models. A SMART KAST TV allows you to have that functionality but in addition it lets you "Kast" or send a personal device to your TV (like an iPhone, home computer etc.) to view photos, video's, your computer screen, etc. (depending on the model) while you are connected to the same WiFi network. It's like having a built-in ChromeCast or Apple TV.