From a viewer standpoint, there isn't a huge difference between 4K vs UHD. 4K is a more popular term than UHD, but 4K-capable Blu-ray drives are marketed as Ultra HD drives. In simple terms ...

A UHD TV has a resolution of 3840 x 2160 pixels, which is exactly twice the number of pixels found in Full HD (1920 x 1080 pixels). This 16:9 aspect ratio is used by most consumer TVs and monitors.

UHD is a consumer display and broadcast ... "2160p" implies that the resolution is double that of 1080p HD, while the actual increase is a factor of 4. The gap between 720p and 1080p is ...

What are the benefits of 4K Ultra-HD to your production ... to consumers, from UHD televisions to 4K on smartphones, and John Heraty talks about the differences between UHD and 4K.