The different monitor resolutions are not exactly standardized, but they are generally manufactured according to a pair of numbers...the number of pixels across and up-and-down. For example, the old VGA stood for 640x480 pixels. W in front of the abbreviation means "wide," and means something closer to a 16:9 aspect ratio, rather than 4:3. Look to the word "resolution" for more information.
Display resolution .
pixels
Every screen will be different. You can approximate for your particular computer by dividing the height of the screen in pixels (the second number in your display resolution) by the height of the screen in centimeters. The number you get will be "pixels per cm" for your screen.
pixels
pixels
Resolution. It determines the clarity and detail of the image on the screen. It is often represented by two numbers, such as 1920x1080, where the first number refers to the horizontal pixels and the second number refers to the vertical pixels.
There are 1080 rows of pixels on a 1080p display.
Retina has a better screen resolution and more pixels, display is better on the Retina
resolution
Resolution
399 pixels refers to the number of individual points of color that make up an image or display across a width of a screen or image. The more pixels there are, the higher the resolution and clarity of the image.
Computer monitors (and all displays really) work by displaying a matrix of tiny dots (called pixels) in a grid which make up the picture on your screen. Display resolution is simply the number of pixels your screen is displaying. Example: 800x600 display resolution means that your display is made up of 800 pixels horizontally by 600 pixels vertically. The higher the resolution, the sharper the image appears, and the smaller details can be rendered. Inversely, higher resolution settings can also make text, images, and webpages appear smaller on your screen, possibly making them more difficult to read.