A widescreen aspect ratio where the image width is 16 units for every 9 units of height (≈ 1.78:1).
16:9 is the default aspect ratio for HDTV and UHDTV systems and for most flat-panel displays. It offers a wider horizontal canvas than 4:3, fitting modern broadcast content, streaming platforms, and many conferencing tools. In commercial AV, 16:9 underpins common video formats (720p, 1080p, 2160p “4K UHD,” 4320p), digital signage players, and collaboration displays. Note: some computer monitors and business projectors use 16:10, so mixed fleets may require attention to scaling, letterboxing, or pillarboxing.
Proposed in the mid-1980s as a compromise to accommodate common film and TV formats; adopted in HDTV standards in the 1990s and became mainstream through the 2000s–2010s as displays shifted from CRT to flat-panel.