An alphabet is a standardized set of basic written graphemes (called letters) representing phonemes, units of sounds that distinguish words, of certain spoken languages.
ɐn ˈælfəbˌɛt ɪz ɐ stˈændɚdˌaɪzd sˈɛt ʌv bˈeɪsɪk ɹˈɪʔn̩ ɡɹˈæfiːmz kˈɔːld lˈɛɾɚz ɹˌɛpɹᵻzˈɛntɪŋ fˈoʊniːmz, jˈuːnɪts ʌv sˈaʊndz ðæt dɪstˈɪŋɡwɪʃ wˈɜːdz, ʌv sˈɜːʔn̩ spˈoʊkən lˈæŋɡwɪdʒᵻz.