FIFO is an acronym for First In, First Out, which is an abstraction related to ways of organizing and manipulation
of data relative to time and prioritization. This expression describes the principle of a queue processing technique or
servicing conflicting demands by ordering process by first-come, first-served (FCFS) behaviour: where the persons
leave the queue in the order they arrive, or waiting one's turn at a traffic control signal.
FCFS is also the jargon term for the FIFO operating system scheduling algorithm, which gives every process CPU
time in the order they come. In the broader sense, the abstraction LIFO, or Last-In-First-Out is the opposite of the
abstract