Sukkot, Succot or Sukkos is a biblical Jewish holiday celebrated on the 15th day of the month of Tishrei (varies from late September to late October). It is one of the three biblically mandated festivals Shalosh regalim on which Hebrews were commanded to make a pilgrimage to the Temple in Jerusalem. It follows the solemn holiday of Yom Kippur, or the Day of Atonement.
The holiday lasts seven days (eight in the diaspora). The first day (and second in the diaspora) is a sabbath-like yom tov (holiday) when work is forbidden, followed by the intermediate Chol Hamoed and Shemini Atzeret. The Hebrew word sukkōt is the plural of sukkah, "booth or tabernacle", which is a walled structure covered with schach (plant material such as leafy tree overgrowth or palm leaves).
The sukkah is intended as a reminiscence of the type of fragile dwellings in which the Israelites dwelt during their 40 years of travel in the desert after the Exodus from slavery in Egypt. Throughout the holiday, meals are eaten inside the sukkah and some people sleep there as well. On each day of the holiday, members of the household recite a blessing over the lulav (closed frond of the date palm tree, bound with boughs and branches of the willow and myrtle trees) and etrog (yellow citron) (Four species).
According to the prophet Zechariah, in the messianic era Sukkot will become a universal festival and all nations will make pilgrimages annually to Jerusalem to celebrate the feast there.(Zech 14:16-19)
Sukkot is a seven-day holiday, with the first day celebrated as a full festival with special prayer services and holiday meals. The remaining days are known as Chol HaMoed ("festival weekdays"). The seventh day of Sukkot is called Hoshana Rabbahh ("Great Hoshana", referring to the tradition that worshippers in the synagogue walk around the perimeter of the sanctuary during morning services) and has a special observance of its own. Outside Israel, the first two days are celebrated as full festivals. Throughout the week of Sukkot, meals are eaten in the sukkah and the males sleep there, although the requirement is waived in case of rain. Every day, a blessing is recited over the Lulav and the Etrog. Observance of Sukkot is detailed in the Book of Nehemiah and Leviticus 23:34-44 in the Bible, the Mishnah (Sukkah 1:1–5:8); the Tosefta (Sukkah 1:1–4:28); and the Jerusalem Talmud (Sukkah 1a–) and Babylonian Talmud (Sukkah 2a–56b).