A chroma key is a visual effects technique that allows you to replace a solid-colored background (typically green or blue) with any image or video. This technique is widely used in video production to make it look like the subject is in a different setting, whether it’s a real-world location or a creative, imagined environment. By digitally removing the background, the subject can be seamlessly integrated into any scene, making chroma key an essential tool for producing dynamic and visually engaging content.