To watch 4K videos on your Samsung smart TV, you'll need to make a few adjustments. First, ensure that your HDMI port supports 4K resolution. Go to the picture settings on your TV, select the Expert option, and then turn on the HDMI UHD Color setting for the specific HDMI port you're using. This will enable your TV to properly display 4K content.
Next, you'll need to have a reliable and fast internet connection to stream 4K content. Many streaming services, like Netflix, offer 4K content, but you'll need to subscribe to their premium plan to access it. Additionally, make sure your streaming device, such as a media player or gaming console, is also capable of outputting 4K video. With the proper setup and a compatible 4K streaming service, you'll be able to enjoy stunning 4K visuals on your Samsung smart TV.