Formal:
* विदा (vidā): This literally means "farewell" and is a common way to say goodbye formally.
* नमस्कार (namaste): This means "greetings" but is also used as a polite way to say goodbye.
* शुभं भवतु (śubhaṁ bhavatu): This means "may you be well" and is a very formal and auspicious way to say goodbye.
Informal:
* अलविदा (alavida): This is a borrowed word from Spanish and is becoming increasingly common in informal settings.
* पुनः मिलेंगे (punaḥ milengē): This means "we will meet again" and is a friendly way to say goodbye.
Other:
* राम राम (rāma rāma): This is a popular greeting and farewell in some parts of India, often used in a casual way.
The best way to choose the appropriate word depends on the situation and the level of formality you want to express.