The basic requirements of the seder were announced and taught to the Jewish people immediately BEFORE the Exodus from Egypt, when it was commanded that the occasion was to be recalled annually. Thus the first seder took place on the night of the Exodus. See Exodus 12, verses 1-20.
Seder = סדר
night of passover
No. A Seder is a Jewish religious meal recalling the Passover.
Sometimes.
Four glasses of wine are drunk as part of the seder.
At the Seder meal we retell the story of the Exodus from Egypt.
Generally it occurs only during Passover, a Jewish holiday. There is also a seder for the holiday of Tu Bishvat, but this seder is rarely observed.
One of the foods on the Seder plate is the Z'roa - a roasted shank-bone of lamb or goat, or a chicken wing, or chicken neck. It symbolizes the korban Pesach (Pesach sacrifice), which was a lamb that was offered in the Temple in Jerusalem, then roasted and eaten as part of the meal on Seder night. See also:More abut the Seder meal
At sundown.
The Passover dinner that is eaten the first night of Passover in Israel, and the first two nights outside of Israel is called the Seder
It is called a Seder, or "Order" in English
The Seder is eaten the first two nights of Passover outside of Israel, and the first night in Israel.