Simply stated, chroma key is the process of photographing a subject against a solid-color background and then removing that background in post-production and replacing it with transparency. The chroma key is a time-honored and widely used visual effects technique. (Blue screens were commonly used in the early days of film, and they may still be used in some cases.) This is typically a single-colored backdrop, which can be any color but is usually bright green because it is the color most dissimilar to human skin tones. The colored background you want to make transparent and remove from your shot is referred to as a green screen.
Everyone has access to expert compositing technology, from Marvel movies to local news stations.
While that is an entirely unscientific assessment that you should not cite in a college paper, given the accessibility and sophistication of today's green screen technology, it is probably not far off. Almost every major film released in 2019 used green screen effects for at least one scene.
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