FIFO

concepts

First In, First Out — a data structure and scheduling principle where the first element added is the first to be removed, as in a queue

Pronunciation

Correct

FY-foh

/ˈfaɪfoʊ/

Two syllables with stress on the first. Pronounced as an acronym, not spelled out. The 'FI' sounds like 'fye' and 'FO' sounds like 'foe'.

Source: pubs.opengroup.org(official spec)

Accepted Variant

F-I-F-O

/ɛf aɪ ɛf oʊ/

Some engineers spell out each letter, particularly in formal contexts. Both forms are widely understood.