Stacked Overlays modals are a user interface design concept where multiple overlay windows, or modals, are displayed on top of each other, typically in a web or app interface. These modals are often used to present additional information, confirm actions, or to guide users through multi-step processes. The key characteristic of Stacked Overlays is their layered appearance, where each new modal partially covers the previous one, creating a stack effect. This stacking can provide a visual cue to users about the depth of their interaction or the sequence of tasks. To maintain usability, these modals are designed with careful attention to transparency, size, and the ability to easily return to previous layers. They often incorporate animations for smooth transitions between layers and may include features like dimming the background to focus user attention on the active modal.