Best Smart HD LED TV The 43-inch 4K Ultra HD Smart TV is a TV with 4K resolution and smart features. The 4K resolution means that the TV screen has 3,840 x 2,160 pixels, providing greater clarity and detail than a traditional full HD TV. Smart features enable TVS to connect to the Internet and provide a variety of online entertainment and services such as video streaming, social media, web browsing and app downloads through built-in apps and functions. Such TVS also typically have built-in Wi-Fi and Bluetooth capabilities to wirelessly connect and share content with other devices.