A Rabbi (Hebrew: רַבִּי, Modern: Rabi, Tiberian: Rabî; plural: Rabbanim or Rabbeim; Yiddish: רבי, Rebbe; Arabic: حاخام, Ḥākhām) is a Jewish teacher, especially one who is qualified to decide questions of Jewish law. The exact role of the rabbi within a Jewish community varies depending on the community, time period, and denomination. In Orthodox Judaism, a rabbi is typically a spiritual leader and teacher, responsible for overseeing Jewish law and tradition. In Reform and Conservative Judaism, rabbis may also serve as community leaders, officiate at life cycle events, and deliver sermons. The title "Rabbi" derives from the Hebrew word Rav (רַב), meaning "master" or "teacher." In ancient times, the term was used to refer to a teacher of Torah, and it continues to be used in this sense today. The role of the rabbi has evolved over time, reflecting the changing needs and circumstances of the Jewish people.