Vada originates from South Indian states of Tamil nadu and Karnataka but now it is popular all over.

The most popular one is the Vadai from Tamil nadu or the Uddina Vade from Karnataka:Similar to a doughnut , a circle with a hole in the center.

Traditionally Vadais are prepared during festivals along with other dishes.

But it is now a common sight in most Indian Fast-Food restaurants nowadays...Popular variations of Vada are Masala vada, Maddur vada, Bonda, Dahi Vada.