ðeɪ ɑːɹ ðɪ ˌɛvəlˈuːʃənˌɛɹi nˈɛkst stˈɛp ˈæftɚ lˈaɪv sˌiːdˈiːz, bˌʌt wɪððɪ ˈædᵻd bˈɛnɪfˌɪt ʌv ɹˈaɪɾəbəl stˈoːɹɪdʒ, ɐlˈaʊɪŋ kˌʌstəmᵻzˈeɪʃənz tə ðə bˈuːɾᵻd ˈɑːpɚɹˌeɪɾɪŋ sˈɪstəm.
They are the evolutionary next step after live CDs, but with the added benefit of writable storage, allowing customizations to the booted operating system.