FIFO (computing and electronics) - Wikipedia
https://en.wikipedia.org/wiki/FIFO_(computing_and_electronics)
WEBIn computing and in systems theory, first in, first out (the first in is the first out), acronymized as FIFO, is a method for organizing the manipulation of a data structure (often, specifically a data buffer) where the oldest (first) entry, or "head" of the queue, is processed first.
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