FIFO meaning in Information Technology ?

Answer: What is First In First Out mean?

In computing and in systems theory, FIFO (an acronym for first in, 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, 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.

FCFS is also the jargon term for the FIFO operating system scheduling algorithm, which gives every process central processing unit (CPU) time in the order in which it is demanded. FIFO's opposite is LIFO, last-in-first-out, where the youngest entry or "top of the stack" is processed first. A priority queue is neither FIFO or LIFO but may adopt similar behaviour temporarily or by default. Queueing theory encompasses these methods for processing data structures, as well as interactions between strict-FIFO queues.

reference

Full Form	Category
First In, Fist Out	Academic & Science
Flow In, Flow Out	Academic & Science
Free In and Free Out	Accounts and Finance
First In First Out (A method of Account valuing Assets)	Business
Fly In Fly Out	Business
Fish In Fish Out	General
First Inventory Find Out	General
First Invite First Out	General
F***ing Idiots From Ohio	General
Food In First Order	General
Fast Inventory From Overstock	General
Free in Free Out	General
Fall In, Fall Out	Governmental
First In First Out	Information Technology
Fit In or F*** Off	Internet
First Input First Output	Stock Exchange