pˈiːsᵻz ʌvðɪ ˌæplɪkˈeɪʃənz kˈoʊd, dˈeɪɾə, ænd sˈɛɾɪŋz ɑːɹ dᵻlˈɪvɚd wɛn ðeɪɚ fˈɜːst nˈiːdᵻd, ɪnstˈɛd ʌvðɪ ɛntˈaɪɚɹ ˌæplɪkˈeɪʃən bˌiːɪŋ dᵻlˈɪvɚd bᵻfˌoːɹ stˈɑːɹɾʌp.
Pieces of the application's code, data, and settings are delivered when they're first needed, instead of the entire application being delivered before startup.