The principal ingredient in sushi is rice, specifically sushi rice, which is seasoned with a mixture of vinegar, sugar, and salt. This type of rice is sticky and allows the ingredients to adhere together, ensuring that the sushi holds its shape. Sushi can incorporate various fillings and toppings, including raw fish, vegetables, and seaweed. While fish often garners attention, sushi rice is critical in defining the dish's texture and flavor profile. This foundational element makes sushi inherently unique and integral to its appeal.