5K is a display resolution measuring 5120 x 2880 pixels. Resolution explains how many pixels a display, like a PC monitor or laptop screen, has in length x width format. The more pixels, the sharper the image looks.
In the world of computing, there aren't 5K laptops ready yet, but there are a few 5K desktop displays. For example, Apple's 27-inch iMac Pro all-in-one PC and LG's 27-inch Ultrafine 5K monitor output at 5120 x 2880.
So who needs 5K resolution with their PC? Few games benefit from running at that high of a resolution. You'll need a powerful graphics card to power 5K, and both of the 5K displays mentioned target creative professionals. So unless you fit that category, you can probably be satisfied with a lower-resolution screen.
Common Monitor Resolutions
|5K||5120 x 2880|
|4K||3840 x 2160 (typical monitor resolution); 4096 x 2160 (official cinema resolution)|
|Ultra HD (UHD)||3840 x 2160|
|QHD aka WQHD aka 1440p||2560 x 1440|
|2K||2560 x 1440 (typical monitor resolution); 2048 x 1080 (official cinema resolution)|
|WUXGA||1920 x 1200|
|Full HD aka FHD aka 1080p||1920 x 1080|
|HD aka 720p||1280 x 720|
This article is part of the Tom's Hardware Glossary.