Most 4K TVs are capable of upscaling automatically. This means that when you watch lower resolution content, such as HD or standard definition, the TV's advanced upscaling technology enhances the image and adds additional pixels of information to improve its clarity. This makes the content look better on the high-resolution display of the TV. However, the quality of upscaling can vary between different TV models and brands, so it's worth considering the upscaling capabilities when purchasing a 4K TV. Additionally, some TVs may offer manual upscaling settings, which allow you to adjust the upscaling process to your preference.