HDTV is High-definition television system providing an image resolution that is substantially higher than that of standard-definition television.
HDTV may be transmitted in various formats:
1080p: 1920×1080p: 2,073,600 pixels (~2.07 megapixels) per frame
1080i: 1920×1080i: 1,036,800 pixels (~1.04 MP) per field or 2,073,600 pixels (~2.07 MP) per frame
Some countries also use a non-standard CEA resolution, such as 1440×1080i: 777,600 pixels (~0.78 MP) per field or 1,555,200 pixels (~1.56 MP) per frame
720p: 1280×720p: 921,600 pixels (~0.92 MP) per frame
The letter “p” here stands for progressive scan, while “i” indicates interlaced.
When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-definition television). HDTV provides a more desirable picture because of the increased amount of pixels, allowing images to be changed up to 60 times per second compared to SD at 30 times per second. This produces a clearer picture due to progressive scanning.