What is a 16:9 Video (Landscape video)?
Landscape videos have an aspect ratio of 16:9 (width to height ratio). It provides a wider rectangle than standard 4:3 videos but it is not as wide as the ones used in theaters. If a movie is watched in its original format it results in letterboxing of the video.
Rise of landscape videos
With the rise in popularity of television, the movie industry hit a low as people stopped going to theaters. To tackle this problem filmmakers started using wider screens like Panavision and Cinemascope. This provided more content and better viewing experience than the 4:3 screens.
With the increase in technology, plasma, and LCD screens came into existence. This provided an opportunity to create screens with higher resolution.
The international standards body came up with new formats called HD (720p) and Full HD (1080p). They also tried to get a standard aspect ratio. To reduce wastage of screen space, a compromise aspect ratio of 16:9 was decided to be the standard.