During the Jewish celebration of Passover or Pesach, a book is used which contains the texts that are read during the service. This book is called Haggadah and contains the story of the Hebrews and their escape from Egyptian slavery. Different groups within Judaism are more and less liberal about the format and content of the Haggadah. Conservative Judaism might use Haggadahs that are written in Hebrew only and conforms strictly to early versions. Reform Judaism uses Haggadahs that have Hebrew next to a local language (such as English), or a local language-only translation so all participants (especially children who might not speak Hebrew) clearly understand everything.