=Rapporto di visualizzazione=
The '''aspect ratio''' is basically the proportion between the screen width and the screen height.
The two more used aspect ratios are:
* '''4:3''' -
This is the standard format for analog television, also known as "pan format".
* '''16:9''' -
This format comes from cinema, and it is also used by the so-called ''wide -screen'' television.
When a 16:9 movie must be shown in a 4:3 screen, it has to be cut at both sides, by removing columns (and content), or it can be shown with black borders in the top and bottom which will allow the whole width to fit in the narrower screen. This latter display method is known as '''letterbox'''.