The etrog is a citrus fruit, specifically a variety of citron, known scientifically as Citrus medica. It is traditionally used in the Jewish holiday of Sukkot, where it is one of the Four Species, alongside the lulav, hadass, and aravah. The etrog is prized for its unique shape, fragrance, and smooth, yellow skin. In addition to its religious significance, the etrog is also appreciated for its culinary uses. It can be used to make preserves, candies, and flavoring for various dishes. The fruit is often grown in Mediterranean climates and is considered a symbol of beauty and holiness in Jewish culture.