The step of the Seder where the Hallel psalms are recited is Hallel.
Hallel means “praise” and is a Jewish prayer made chiefly from Psalms 113–118. At the Passover Seder, the opening psalms—Psalms 113 and 114—are traditionally recited before the meal. After Barech, the remaining Psalms 115–118 are recited in the formal Hallel step, followed in many Haggadahs by Psalm 136, known as the Great Hallel.
This split arrangement can cause confusion. Maggid is the section that tells the Exodus story and includes the Four Questions; Barech is the blessing after the meal; and Nirtzah is the concluding prayer that the Seder be accepted. The named step is still Hallel because it is the section centered on the festival’s songs of praise.
Hallel is also recited on other Jewish festivals and on Hanukkah, though customs differ over when a full or partial version is said. At the Seder, it expresses thanksgiving for deliverance from Egypt and is traditionally connected with the fourth cup of wine.