Monitor Resolution Explained
Updated
A monitor's resolution describes how many pixels it uses to generate the picture, commonly referenced in Width: Height format eg. 1920x1080P meaning 1920 pixels wide and 1090 pixels tall.
As pixel count/density increases, higher levels of detail become possible to display.
There are a number of fairly common monitor resolutions such as 1920x1080p (referred to as Full HD or "FHD"), 2560x1440p (Quad High Definition or "QHD"), and 3840x2160p (Ultra HD, "UHD," or "4K").