Overlay may refer to:
- Overlay architecture, term used to describe ‘event architecture’ and relates to the temporary elements that supplement existing buildings and infrastructure to enable the operation of major sporting events or festivals.
- Overlay Control in semiconductor manufacturing, for monitoring layer-to-layer alignment on multi-layer device structures.
- Video overlay, techniques to display video on computer display.
- Hardware overlay, one type of video overlay that uses memory dedicated to the application.
- Overlay (programming), a technique to reduce the amount of memory used by a program.
- Overlay (operating system), replacing one process by another
- Historic overlay district, a zoning district that applies special rules to a portion of other districts, usually for historic or conservation reasons.
- Overlay network, a computer network which is built on top of another network
- Overlay plan, a method of introducing new area codes in telephony
- Overlay keyboard, a specialized keyboard with no pre-set keysmethod of introducing new area codes in telephony
- An overlay in gambling is where the bettor thinks the odds given are too generous
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