Traditional animation (also called cel animation or hand-drawn animation) was the process used for most animated films of the 20th century.
tɹɐdˈɪʃənəl ˌænɪmˈeɪʃən ˈɔːlsoʊ kˈɔːld sˈɛl ˌænɪmˈeɪʃən ɔːɹ hˈænddɹˈɔːn ˌænɪmˈeɪʃən wʌzðə pɹˈɑːsɛs jˈuːzd fɔːɹ mˈoʊst ˈænɪmˌeɪɾᵻd fˈɪlmz ʌvðə twˈɛntiəθ sˈɛntʃɚɹi.