The afikoman is the half of the middle matzah that was hidden away to be eaten for the end of the meal.We eat the afikoman after shulchan orech.  There is a question if the afikoman is intended to remember the paschal offering or the matzah that was eaten together with it. Because of this we eat the Lubavetchers custom of two kazeitim. The afikoman should  be eaten while reclining on the left side, without stopping or interruption. At the first seder, the afikoman should be eaten before midnight. After the afikoman, nothing should be eaten for the remainder of night. The only exception are the remaining 2 cups of wine. We do this so that the taste of the matzah will stay in our mouth.

The word afikoman can be divided into 2 words...afiko  man which means “ bring out sustenance”. Eating the afikoman brings Hashem's strengths and  power into the material world.

The afikoman is related to the paschal sacrifice. Both are eaten at the end of the meal when the person has already satisfied his hunger.  Rav Sholem Kaidnaner, asked Rebbe Maharash the meaning of tzafun. He said it means hidden. 

Eating the afikoman allows us to destroy the hidden evil in our heart.  

Source: At Our Rebbe Seder Table collected from the works of the Lubavitcher Rebbe and Rabbi Menachem M. SchneersonGZFqLLD3VflZdhLTKMORR1-pg6POsmkN-kZVZ9oYD25VkymUj2pNNuH09QGhzVOODbqQFFXXpDayAhpRD98jLFIS_rX1Jg2EBI8yEphHNucNTX4aW4ipm2O_nmWhKcdzzfBfliaH


haggadah Section: Tzafun