At its core, a green screen studio is a space where creators shoot footage in front of a large green backdrop. This green colour is then replaced in post-production with any background of the creator's choosing, thanks to the process of chroma keying.

Green screens allow you to film in a studio—or anywhere that allows for a solid-color background—and then add the background later. Chroma keying also enables creatives to more easily work around casting conflicts, such as when two major players can't be present at the same time.