The phrase "2K Movie Streaming" refers to the continuous playback of video data at a 2K resolution. The 2K video format has a resolution of 1080 by 2048 pixels. This is a slight increase over the 1080p HD format, which has a resolution of 1080 by 1920 pixels.
In 2013, some television broadcasters and online streaming services began to offer videos in 4K resolution, which is 2160 by 4096 pixels, maintaining the same aspect ratio as the 2K standard. As of 2015, broadcasts in 4K are still relatively uncommon, as film industry professionals prefer to capture footage at a higher resolution than the intended broadcast resolution. This means that only analog film cameras can capture the level of detail necessary for a 4K broadcast.