How many glasses of wine do Jews drink during the seder meal?

There are 4 cups used 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.