Pixel(picture element) is a smallest controllable element of a display device and therefore pixels are basic building blocks of any image you see on screen.Д®ach pixel is divided into three subpixels, each showing one color of varying intensity/brightness: red, green and blue(RGB). Some standard display resolutions and their market names/acronyms:ДЎ280 x 720 (720p, HD, HD Ready, Standard HD)Дў560 x 1440 (1440p, Wide Quad HD, Quad HD, WQHD, QHD)ДЄspect ratio of a display device is a ratio between the width and the height of the screen.

Furthermore, more viewable content can fit onto a higher resolution screen. The higher the display resolution is, the sharper and clearer displayed content can be because a higher resolution monitor will be made up of more pixels than a lower resolution monitor.

It is usually noted in a format of width x height, for instance: 1920 x 1080 means the width is 1920 pixels and the height is 1080 pixels which in this case would give total of 2,073,600 pixels on screen. Screen or display resolution of electronic visual display device is the number of individual pixels in each axis that can be displayed on screen.

Web image resolution for retina display