An overlay when editing is an image or graphic that you place over existing footage to achieve a certain look or effect. Overlays are most commonly used for titles, video transitions, lower thirds, and logo animations. They can also be used for special effects such as chroma keying and compression artifacts. Overlays are usually created by editing software and can often be imported from other sources, such as stock footage, 3D models, and photographs.
With overlays, you can quickly and easily add a professional touch to your videos. They are a great way to enhance your videos and add an extra level of detail. They can be used to bring the viewer more information, such as titles and subtitles, or to introduce a unique perspective, such as a distorted image or blurred out graphic.
When working with overlays, there are a few things to keep in mind. You should always make sure the overlay is in the right place and matches the look of the footage it is being applied to. Additionally, if the overlay contains text, it should be legible and relevant to the scene. If done correctly, overlays can be used to help create a more dynamic and visually engaging video.