Overlay

An overlay is a term used in various fields, such as digital graphics or mapping, to describe a layer of information or content placed on top of an existing background or base. It enhances or adds to what is already there without replacing it, much like a transparent sheet of paper with notes placed over a painting. Overlays can include images, text, or other data, enabling users to view additional details or modifications while still seeing the original. This technique helps present complex or supplementary information clearly and efficiently.