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The Chabad-Lubavitch movement is a branch of Orthodox Judaism that originated in the 18th century in Eastern Europe. It is led by a Grand Rabbi, who is considered to be the direct descendant of the movement's founder, Rabbi Schneur Zalman of Liadi. Chabad-Lubavitch emphasizes the importance of prayer, study, and good deeds, and is known for its outreach efforts to Jews around the world.