16:9 (1.77:1) is a widescreen aspect ratio with a width of 16 units and height of 9 units.

Once seen as exotic, since 2009, it has become the most common aspect ratio for televisions and computer monitors, and is also the international standard image format for UHD, HDTV, Full HD, and SD digital television today.

16:9 (1.77:1) (spoken as "sixteen by nine," "sixteen to nine," or simply "sixteen-nine") is the international standard format of Ultra HD, non-HD digital widescreen television and analog widescreen television systems PALplus and Wide-aspect Clear-vision. Japan's Hi-Vision originally started with a 5:3 (1.66:1) ratio but converted when the international standards group introduced a wider ratio of 16:9. Many digital video cameras have the capability to record in 16:9, and 16:9 is the only widescreen aspect ratio natively supported by the Ultra HD Blu-ray standard. It is also the native aspect ratio of Ultra HD Blu-ray discs, but Ultra HD Blu-ray producers can also choose to show even wider ratios such as 2.00:1 and 2.40:1 within the 16:9 Ultra HD Blu-ray frame by hard matting or adding black bars within the image itself.