Overlay

Overlay may refer to:

• Overlay architecture, "event architecture" relating 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
• Historic overlay district, a zoning district that applies special rules to a portion of other districts, usually for historic or conservation reasons
• Overlay plan, a method of introducing new area codes in telephony
• In gambling, an overlay is where the bettor thinks the odds given are too generous

In computer tech

• Overlay network, a computer network which is built on top of another network
• Hardware overlay, one type of video overlay that uses memory dedicated to the application
• Overlay (operating system), replacing one process by another
• Overlay (programming), a technique to reduce the amount of memory used by a program
• Overlay keyboard, a specialized keyboard with no pre-set keys
• Keyboard overlay, a sheet of printed text sitting between the keys, depicting an alternate keyboard layout