The Nagara, the Dravida and the Vesara are

The terms Nagara, Dravida and Vesara refer to three principal orders or styles of Hindu temple architecture in India. Texts and scholarship identify Nagara as the northern style characterized by a shikhara over the sanctum and Dravida as the southern style with its distinct vimana and gopuram features; both are classical temple “languages” of the subcontinent [2]. Vesara is understood as a hybrid or mixed tradition, especially in the Deccan, combining elements of Nagara and Dravida forms and evolving under regional dynasties like the Chalukyas and Rashtrakutas [3]. Hence they denote architectural styles, not racial, linguistic, or musical categories.

Sources

1. [1] History , class XI (Tamilnadu state board 2024 ed.) > Chapter 7: The Guptas > Rock-cut and Structural Temples > p. 98
2. [2] https://ncert.nic.in/textbook/pdf/kefa106.pdf
3. [3] History , class XI (Tamilnadu state board 2024 ed.) > Chapter 9: Cultural Development in South India > Conclusion > p. 129