日本酒, or sake, is a traditional Japanese alcoholic beverage made from fermented rice. The brewing process involves polishing the rice to remove the outer layers, which helps create a cleaner taste. Sake can be enjoyed warm or cold, depending on the type and personal preference. There are various types of 日本酒, including 純米酒 (junmai), which is made only from rice, water, yeast, and koji mold, and 吟醸酒 (ginjo), which is brewed with highly polished rice for a more refined flavor. Sake is often served during special occasions and is an integral part of Japanese culture.