Overlays & Surfaces
Sheet
also known as surface sheet
A sheet is a container that enters from an edge of the screen (bottom, side) and holds supplementary or task content. It's the parent concept behind bottom sheets and side sheets. Sheets can be modal (with a scrim) or standard/persistent (coexisting with the main content). On iOS, 'sheet' also refers to card-like modal presentations that slide up.
See it live — shadcn/ui · MUI · Ant Design
Don't confuse it with
Sheet is the general edge-anchored surface; bottom sheet and side sheet are its directional variants. A drawer is a specific kind of sheet used for navigation. A sheet may be modal or non-modal, so 'sheet' alone doesn't tell you if it blocks the background.
In the wild
The panel that slides up when you tap Share in iOS is a sheet.