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{{shortShort description|Region of a physical memory storageMemory used to temporarily storein data while it is being moved from one place to anothertransfers}}

{{redirect distinguish|Memory buffer|memory buffer register}}

In [[computer science]], a '''data buffer''' (or just '''buffer''') is a region of a physical memory storage used to temporarily store [[data]] while it is being moved from one place to another. Typically, the data is stored in a buffer as it is retrieved from an [[input device]] (such as a microphone) or just before it is sent to an output device (such as speakers). However, a buffer may be used when moving data between [[Process (computing)|processes]] within a computer. This is comparable to buffers in telecommunication. Buffers can be implemented in a fixed memory ___location in hardware—or by using a virtual data buffer in software, pointing at a ___location in the physical memory. In all cases, the data stored in a data buffer are stored on a [[computer data storage|physical storage medium]]. A majority of buffers are implemented in [[software]], which typically use the faster [[Random-access memory|RAM]] to store temporary data, due to the much faster access time compared with [[hard disk drive]]s. Buffers are typically used when there is a difference between the rate at which data is received and the rate at which it can be processed, or in the case that these rates are variable, for example in a printer spooler or in [[Video hosting service|online video]] [[Streaming media|streaming]]. In the [[distributed computing]] environment, data buffer is often implemented in the form of [[burst buffer]] that provides distributed buffering service.

In [[computer science]], a '''data buffer''' (or just '''buffer''') is a region of memory used to store [[data]] temporarily while it is being moved from one place to another. Typically, the data is stored in a buffer as it is retrieved from an [[input device]] (such as a microphone) or just before it is sent to an output device (such as speakers); however, a buffer may be used when data is moved between [[process (computing)|processes]] within a computer, comparable to buffers in telecommunication. Buffers can be implemented in a fixed memory ___location in hardware or by using a virtual data buffer in software that points at a ___location in the physical memory.

A buffer often adjusts timing by implementing a [[Queue (data structure)|queue]] (or [[FIFO (computing and electronics)|FIFO]]) algorithm in memory, simultaneously writing data into the queue at one rate and reading it at another rate.

In [[computer science]], a '''data buffer''' (or just '''buffer''') is a region of a physical memory storage used to temporarily store [[data]] while it is being moved from one place to another. Typically, the data is stored in a buffer as it is retrieved from an [[input device]] (such as a microphone) or just before it is sent to an output device (such as speakers). However, a buffer may be used when moving data between [[Process (computing)|processes]] within a computer. This is comparable to buffers in telecommunication. Buffers can be implemented in a fixed memory ___location in hardware—or by using a virtual data buffer in software, pointing at a ___location in the physical memory. In all cases, the data stored in a data buffer areis stored on a [[computer data storage|physical storage medium]]. AThe majority of buffers are implemented in [[software]], which typically use the faster [[Random-access memory|RAM]] to store temporary data, duebecause toof theits much faster access time when compared with [[hard disk drive]]s. Buffers are typically used when there is a difference between the rate at which data is received and the rate at which it can be processed, or in the case that these rates are variable, for example in a printer [[spooler]] or in [[Video hosting service|online video]] [[Streaming media|streaming]]. In thea [[distributed computing]] environment, data bufferbuffers isare often implemented in the form of [[burst buffer|burst buffers]], thatwhich provides distributed buffering serviceservices.

A buffer often adjusts timing by implementing a [[Queuequeue (data structure)|queue]] (or [[FIFO (computing and electronics)|FIFO]]) algorithm in memory, simultaneously writing data into the queue at one rate and reading it at another rate.

==Applications==

Buffers are often used in conjunction with [[I/O]] to [[computer hardware|hardware]], such as [[disk drives]], sending or receiving data to or from a [[Computer network|network]], or playing sound on a speaker. A line to a [[rollercoaster]] in an amusement park shares many similarities. People who ride the coaster come in at an unknown and often variable pace, but the roller coaster will be able to load people in bursts (as a coaster arrives and is loaded). The [[queue area]] acts as a buffer—a temporary space where those wishing to ride wait until the ride is available. Buffers are usually used in a [[FIFO (computing and electronics)|FIFO]] (first in, first out) method, outputting data in the order it arrived.

Buffers can increase application performance by allowing [[synchronous]] operations such as file reads or writes to complete quickly instead of blocking while waiting for hardware interrupts to access a physical disk subsystem; instead, an operating system can immediately return a successful result from an API call, allowing an application to continue processing while the kernel completes the disk operation in the background. Further benefits can be achieved if the application is reading or writing small blocks of data that do not correspond to the block size of the disk subsystem, allowingwhich allows a buffer to be used to aggregate many smaller read or write operations into block sizes that are more efficient for the disk subsystem, or in the case of a read, sometimes to completely avoid having to physically access a disk.<!-- in a disk problem set of data transformation its call by-->

==Telecommunication buffer==

A buffer [[Subroutine|routine]] or [[data storage device|storage]] [[Recording medium|medium]] used in telecommunications compensates for a difference in rate of flow of [[data]], or [[time of occurrence]] of events, when transferring data is transferred from one device to another.

Buffers are used for many purposes, including:

* Interconnecting two [[Digital data|digital]] circuits operating at different rates,.

* Holding data for later use,.

* Allowing timing corrections to be made on a [[data stream]],.

* Collecting [[Binary numeral system|binary]] data bits into groups that can then be operated on as a unit,.

* Delaying the transit time of a [[Signalling (telecommunication)|signal]] in order to allow other operations to occur.

==Examples==

*The [[BUFFERS (CONFIG.SYS directive)|BUFFERS]] command/statement in [[CONFIG.SYS]] of [[DOS]].

*The buffer between a serial port ([[Universal asynchronous receiver-transmitter|UART]]) and a [[modem]]. The [[COM port]] speed may be 38400 bit/s while the modem may have only a 14400 bit/s [[carrier wave|carrier]].

*The integrated [[disk buffer]] on a hard disk drive, printersolid orstate otherdrive pieceor ofBD/DVD/CD hardwaredrive.

*The integrated [[Static random-access memory|SRAM]] buffer on an [[Ethernet adapter]].<ref> https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/82576eb-gigabit-ethernet-controller-datasheet.pdf {{Bare URL PDF|date=August 2025}}</ref>

*The [[Windows NT kernel]] also manages a portion of [[main memory]] as the buffer for slower devices such as [[sound card]]s and [[network interface controller]]s.<ref>{{cite web | url=https://learn.microsoft.com/en-us/windows-hardware/drivers/netcx/network-data-buffer-management | title=Network data buffer management - Windows drivers }}</ref><ref>https://learn.microsoft.com/en-us/previous-versions/windows/desktop/ee416820%28v=vs.85%29</ref>

*The [[framebuffer]] on a video card.

==History==

An early mention of a print buffer is the "Outscriber" devised by image processing pioneer Russel A. Kirsch for the [[SEAC (computer)|SEAC computer]] in 1952:<ref>{{Cite journal

| title = SEAC Maintenance Manual: The Outscriber

| journal = National Bureau of Standards Report

| volume = 2794

| date = July 1953

| url = https://www.nist.gov/msidlibrary/doc/kirsch_1953_nbs2794.pdf }}</ref>

| access-date = 2017-07-13

| archive-date = 2020-02-15

| archive-url = https://web.archive.org/web/20200215063219/https://www.nist.gov/msidlibrary/doc/kirsch_1953_nbs2794.pdf

| url-status = dead

}}</ref>

<blockquote>

One of the most important

problems in the design of automatic digital computers is that of getting the calculated results out of the machine rapidly enough to avoid delaying the further progress of the calculations. In many of the problems to which a general-purpose computer is applied the amount of output data is relatively big —so— so big that serious inefficiency would result from forcing the computer to wait for these data to be typed on existing printing devices. This difficulty has been solved in the SEAC by providing magnetic recording devices as output units. These devices are able to receive information from the machine at rates up to 100 times as fast as an electric typewriter can be operated. Thus, better efficiency is achieved in recording the output data; transcription can be made later from the magnetic recording device to a printing device without tying up the main computer.

</blockquote>

==See also==

* [[Bucket (computing)]]

* [[Buffer overflow]]

* [[Buffer underrun]]

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* [[Variable length buffer]]

* [[Optical buffer]]

* [[MissingNo.]], the result of buffer data not being cleared properly in [[Pokémon Red and Blue|''Pokémon Red'' and ''Blue'']]

* [[16550 UART#The 16550 FIFO|UART buffer]]

* [[ENOBUFS]], [[POSIX]] error caused by lack of memory in buffers