What is aspect ratio?

“Aspect Ratio” refers to the ratio between the horizontal (width) measurement and the vertical (height) measurement of the screen. The two aspect ratios used are 4:3 and 16:9. That is, (4) units wide by (3) units high, and (16) units wide by (9) units high respectively.

The 16:9 aspect ratio is the standard for HDTVs because significantly more information can be displayed on the screen.