The terms UHD and 4K have become so conflated that TV makers, broadcasters, and tech media use them interchangeably—but they're not the same thing.

If you've been looking at a new TV or monitor, it's likely you've heard mentions of "4K" and "UHD," or Ultra High Definition. Here's what they really mean.

When it comes to TVs, 4K and Ultra HD (or UHD) are referring to the same resolution. Those TVs, along with Ultra HD Blu-ray, and nearly all UHD streaming content from Netflix, Amazon and others ...

The latter is on sale for $134.99 (down from $153.99), while just preordering the film on 4K UHD is on sale for $29.99, down from an MSRP of $37.99. Both are expected to release on December 5 this ...