Привет[privet] - Hi! Здравствуйте[zdravstvuite] - Hello.(More formal and polite.)

Привет we say privet

Привет

Thank you very much. Can you please send me the voice message, so that I can know the pronunciation?

We commonly say "Привет!", which is always appropriate in informal situations. You can also say "Здоро́во!", which is a bit old-fashioned, but still OK