The traditional dance form of Tamil Nadu is:

Bharatanatyam
Kathakali
Kuchipudi
Odissi

The traditional dance form of Tamil Nadu is Bharatanatyam. It is a classical dance form that originated in the state of Tamil Nadu in southern India. It is one of the oldest and most popular dance forms in India. Bharatanatyam is a highly stylized dance form that uses a variety of hand gestures, facial expressions, and body movements to tell stories from Hindu mythology. The dance is accompanied by music and singing.

Kathakali is a classical dance form that originated in the state of Kerala in southern India. It is a highly stylized dance form that uses a variety of masks, makeup, and costumes to tell stories from Hindu mythology. The dance is accompanied by music and singing.

Kuchipudi is a classical dance form that originated in the state of Andhra Pradesh in southern India. It is a highly stylized dance form that uses a variety of hand gestures, facial expressions, and body movements to tell stories from Hindu mythology. The dance is accompanied by music and singing.

Odissi is a classical dance form that originated in the state of Odisha in eastern India. It is a highly stylized dance form that uses a variety of hand gestures, facial expressions, and body movements to tell stories from Hindu mythology. The dance is accompanied by music and singing.

In conclusion, the traditional dance form of Tamil Nadu is Bharatanatyam. It is a classical dance form that originated in the state of Tamil Nadu in southern India. It is one of the oldest and most popular dance forms in India. Bharatanatyam is a highly stylized dance form that uses a variety of hand gestures, facial expressions, and body movements to tell stories from Hindu mythology. The dance is accompanied by music and singing.