Buffer

Template:Wiktionarypar Buffer can refer to:

Buffer state, a country lying between two potentially hostile greater powers, thought to prevent conflict between them
Buffer zone, any area that keeps two or more other areas distant from one another, may be demilitarized
Buffer (rail transport), a device that cushions the impact of vehicles against each other
Buffer stop (bumper in U.S.), a device to prevent railway vehicles from going past the end of a section of track
Recoil buffer, an accessory for firearms, to cushion the impact of recoil
Film loop, isolates intermittent motion in a movie projector

In chemistry:

Buffer solution, in chemistry, stabilizes the pH (acidity or alkalinity) of a liquid
Buffer gas, an inert or nonflammable gas

In electronics and computer science:

Buffer (computer science), memory used to temporarily store output or input data
Buffer (telecommunication), a routine or storage medium used to compensate for a difference in rate of flow of data between devices
Buffer amplifier (also sometimes simply called a buffer) is an isolating circuit used in electronics or telecommunications
Buffer (optical fiber), a component used to encapsulate one or more optical fibers in a fiber optic communication cable
Vacuum column, isolates intermittent motion in a Magnetic tape drive