What is Sukkot?
Sukkot is a weeklong Jewish holiday that comes five days after Yom Kippur. Sukkot celebrates the gathering of the harvest and commemorates the miraculous protection G‑d provided for the children of Israel when they left Egypt. We celebrate Sukkot by dwelling in a foliage-covered booth (known as a sukkah) and by taking the “Four Kinds” (arba minim), four special species of vegetation.
The first two days of the holiday (one day in Israel) are yom tov, when work is forbidden, candles are lit in the evening, and festive meals are preceded by Kiddush and include challah dipped in honey.
The intermediate days are quasi holidays, known as Chol Hamoed. We dwell in the sukkah and take the Four Kinds every day of Sukkot (except for Shabbat, when we do not take the Four Kinds).
The final two days are a separate holiday (one day in Israel): Shemini Atzeret / Simchat Torah. (Chabad)