Curd vada, also known as South Indian thayir vada, is a popular snack in South India. It is made by deep-frying lentil fritters and then soaking them in seasoned yogurt. The vadas are crispy on the outside and soft on the inside, and the tangy yogurt adds a refreshing flavor. This dish is often served as a snack or as part of a meal, and it is especially enjoyed during festivals and special occasions.