Cultural intelligence is described as “the ability to understand why members of other cultures act in the ways they do. Rather than dismissing foreign behaviors as weird, inferior, or immoral, people high in cultural intelligence can appreciate differences even if they do not necessarily share another culture’s views or adopt its way of doing things” (Biswas-Diener & Thin, 2024, Defining Culture, para. 6).
Cultural intelligence is something that comes to mind when I think of the number of different ways Japanese people communicate with each other. Depending on what context one is in, there are different words and expressions used exclusively in those contexts. For example, if one is talking to a friend you would use terms like "I", "Hello", "Sorry", and more in casual ways. However, they'd never use such terms with a Boss, always opting with formal speech. As a matter of fact, there is something called "Business Japanese" which is its own thing. I find it interesting that in English, when we switch from casual to formal speech, the differences are not as prominent in Japanese (I think atleast). For example, there's no other way in English you'd say "I", but there are three in Japanese at the top of my head.