Single-user operating systems don't let people create their own "accounts" on the computer - there is only one user. A multi-user operating system lets multiple users interact with the system at the same time.
s ɪ ŋ ɡ ə l j uː z ə ɹ ɹ WORD_BOUNDARY ɑ p ə ɹ ɹ eɪ t ɪ ŋ WORD_BOUNDARY s ɪ s t ə m z WORD_BOUNDARY d oʊ n t WORD_BOUNDARY l ɛ t WORD_BOUNDARY p iː p ə l WORD_BOUNDARY k ɹ iː eɪ t WORD_BOUNDARY ð ɛ ɹ WORD_BOUNDARY oʊ n WORD_BOUNDARY ʌ k aʊ n t s WORD_BOUNDARY ɔ n ð ə WORD_BOUNDARY k ə m p j uː t ə ɹ WORD_BOUNDARY ð ɛ ɹ WORD_BOUNDARY ɪ z WORD_BOUNDARY oʊ n l i WORD_BOUNDARY w ʌ n WORD_BOUNDARY j uː z ə ɹ ɹ WORD_BOUNDARY ʌ WORD_BOUNDARY m ʌ l t aɪ j uː z ə ɹ ɹ WORD_BOUNDARY ɑ p ə ɹ ɹ eɪ t ɪ ŋ WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY l ɛ t s WORD_BOUNDARY m ʌ l t ɪ p ə l WORD_BOUNDARY j uː z ə ɹ z WORD_BOUNDARY ɪ n t ə ɹ ɹ æ k t WORD_BOUNDARY w ɪ ð ð ə WORD_BOUNDARY s ɪ s t ə m WORD_BOUNDARY æ t WORD_BOUNDARY ð ə WORD_BOUNDARY s eɪ m WORD_BOUNDARY t aɪ m WORD_BOUNDARY