Mechitza
A mechitza (Hebrew: מחיצה, partition or division, pl.: מחיצות, mechitzot) in Judaism is a partition, particularly one that is used to separate men and women.
The rationale in halakha (Jewish law) for a partition dividing men and women is derived from the Babylonian Talmud. A divider in the form of a balcony was established in the Temple in Jerusalem for the Simchat Beit HaShoeivah ceremony, a time of great celebration and festivity. The divider was first established to preserve modesty and attention during this time.
During the mid-20th century, a substantial number of Orthodox synagogues did not have mechitzot. However, the Orthodox Union (OU), the main body of Modern Orthodox synagogues in the United States, adopted a policy of not accepting as new members synagogues without mechitzot, and strongly encouraged existing synagogues to adopt them. Men and women are generally not separated in most Conservative synagogues, but it is a permissible option within Conservative Judaism; some Conservative synagogues, particularly in Canada, have separate seating for men and women, with or without a physical partition. Reform congregations, consistent with the movement's core value of gender equality, do not use mechitzot in their synagogues.