Aspect ratio measures the relationship between the width and height of a display screen, sensor, or image.
Another chance to read Serge Golikov's excellent article on the the often-confusing matter of aspect ratios, letterboxing, and pillarboxing, giving RedShark readers a lesson of cinematic rectangles ...
The aspect ratio states the comparison of width to height and is commonly used to describe the shape of a TV or computer screen. For example, the aspect ratio of an earlier standard-definition (SD) ...