There are 4 cups used during the Seder.
The red wine at the seder symbolises HaShem's four statements of redemption in the Torah:
The wine represents redemption while the colour of the red wine reminds us of the blood of the children killed for the Pharaoh.
Four glasses of wine are drunk during the seder. The red wine at the seder symbolises HaShem's four statements of redemption in the Torah: 1. "I took you out" 2. "I rescued you" 3. "I liberated you" 4. "I took you to Me for a people" The wine represents redemption while the colour of the red wine reminds us of the blood of the children killed for the Pharaoh.
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.
The word 'seder' is Hebrew for 'order'. The Jewish Seder is the ceremonial meal in Passover, during which, according to a set of ancient customs and text, we recount the Exodus from Egypt.
The Seder Plate is a special plate for holding the symbolic foods used during the seder. Pieces of the symbolic foods are distributed to everyone during the course of the seder. Traditionally, the person leading the seder is the only one with a Seder Plate. However if there are many guests, additional Seder Plates can also be set on the table.
Reform Jews have only 1 seder instead of 2.
In truth, during the Pesach seder, Moses isn't mentioned. That's because we're supposed to focus on what happened, not Moses's involvement. During the seder, the story of the the exodus is read.
Yes
The Jews eat the Passover Seder meal on the night of Passover (Pesach). It makes little difference whether Passover begins on Shabbat or on a weekday. Note that there are festive meals on every Shabbat, but they are not called "seder" and the foods are different.
The dining table is laid out with normal place settings (plates, cutlery, glasses, etc.), the Seder plate, matzot, bottles of wine, and bowls of salt water. There isn't a plate for Eliyahu, it's a full glass of wine that sits next to the Seder plate.
The Haggadah contains the service for the seder.
According to the Torah Moses was told by God to go to Egypt and command the pharoah in his name to let his people, the Jews, go. This and the struggle that ensues make up the story and reason of Passover, during which the seder is eaten.
At the Seder meal we retell the story of the Exodus from Egypt.