From Wiki: There is a Rabbinic requirement that four cups of wine are to be drunk during the seder meal. This applies to both men and women. The Mishnah says (Pes. 10:1) that even the poorest man in Israel has an obligation to drink. Each cup is connected to a different part of the seder: the first cup is for Kiddush, the second cup is connected with the recounting of the Exodus, the drinking of the third cup concludes Birkat Hamazon and the fourth cup is associated with Hallel.
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