Which aspect ratio is used in most modern images and screens?

The aspect ratio most commonly used in modern images and screens is 16:9. This aspect ratio is widely adopted for various display devices, including computer monitors, television screens, smartphones, and tablets. The 16:9 aspect ratio is particularly suitable for widescreen content, providing a more immersive viewing experience for movies, TV shows, and gaming. It is also the standard aspect ratio for Full HD (1080p) and higher resolutions, such as 4K Ultra HD (2160p) and 8K UHD (4320p).