Aleinu is the Jewish prayer traditionally recited near the conclusion of most synagogue services.
Its name comes from the Hebrew words meaning “it is our duty,” the opening phrase that calls on Jews to praise God and affirm divine unity. The prayer also expresses hope that all humanity will recognize God.
Aleinu is often followed by a mourner’s Kaddish, although local customs vary. It is not the same prayer as the Amidah, which is the central standing prayer, or the Kaddish, which has several forms and functions.
The prayer is especially associated with the High Holy Days, when it may be recited in a more elaborate liturgical setting. Its exact wording and position can differ among Ashkenazi, Sephardi, and other Jewish traditions.