In what context would you greet someone with saudações instead of bom dia or boa tarde for example?

In what context would you greet someone with saudações instead of bom dia or boa tarde for example?

Hello Skylervm,

I’m going to give you the brazilian context answer.

The term “Salutation” is rarely used here in Brazil and It’s only used in literature.
It litertaly means “Salutation”/“Greetings”, in other words, it’s just a word the represents a “Greeting” as Bom dia or Boa Noite.

If I did not explained it clearly, let me know. I’ll do my best to help you.