In traditional animation, images are drawn or painted by hand on transparent celluloid sheets (cels) to be photographed and exhibited on film.
ɪn tɹɐdˈɪʃənəl ˌænɪmˈeɪʃən, ˈɪmɪdʒᵻz ɑːɹ dɹˈɔːn ɔːɹ pˈeɪntᵻd baɪ hˈænd ˌɔn tɹænspˈæɹənt sˈɛljuːlˌɔɪd ʃˈiːts sˈɛlz təbi fˈoʊɾəɡɹˌæft ænd ɛɡzˈɪbɪɾᵻd ˌɔn fˈɪlm.