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[[file:Data Queue.svg|thumb|Representation of a FIFO queue]]
[[International Standard Book Number|In]] computing and in [[systems theory]], '''FIFO''' an [[acronym]] for '''first in, first out''' (the first in is the first out) is a method for organising the manipulation of a data structure (often, specifically a [[data buffer]]) where the oldest (first) entry, or "head" of the [[Queue (data structure)|queue]], is processed first.
Such processing is analogous to servicing people in a [[queue area]] on a [[first-come, first-served]] (FCFS) basis, i.e. in the same sequence in which they arrive at the queue's tail.
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