Sushi (寿司 or 鮨) is the most famous Japanese dish outside of Japan, and one of the most popular dishes among the Japanese. In Japan, sushi is usually enjoyed on special occasions, such as a celebration.
In past centuries, "sushi" referred to pickled fish preserved in vinegar. Nowadays sushi can be defined as a dish containing rice which has been prepared with sushi vinegar. There are many different types of sushi.