What does the term "overlay" refer to in video production?

The term "overlay" in video production specifically refers to a visual element that is placed over a video image. This can include graphics, text, logos, or any other visual content that enhances the primary footage without replacing it. Overlays are often used to provide additional information, such as subtitles or titles, and can create visual interest or context for the viewer.

In contrast to the other options, which describe different aspects of video production, overlay focuses exclusively on the integration of visual elements within the frame of existing video content. Color correction is a process applied to the entire video to adjust and enhance hues and tones, layering sound tracks involves audio manipulation rather than visual, and editing multiple video clips together deals with the sequencing of footage rather than adding visuals on top of an image. Understanding the concept of overlays is crucial for effective visual storytelling in video production.