Shabbat
Shabbat is the name of the day of rest in Judaism. Shabbat happens on the seventh day (Saturday) of every week.  In Judaism, the day is defined with the cycle of the sun: The day begins and ends at sunset, not midnight.  So the seventh day of the week, Shabbat, begins Friday when the sun goes down, and ends Saturday night after it gets dark.  The idea of Shabbat comes from the Bible's story of Creation. In that story, God creates the Universe and everything on Earth for six days. On the seventh day, he stops work. In the same way, Jews work on the first six days of the week and rest on the seventh day, Shabbat.