"Wow!" is an interesting exclamation that has become extremely popular in English, and, it seems, other languages too. Until about the year 1990 (?) I never heard it in British English. It seems to have filled a void - although we have long had exclamations like "Gosh!" and "Oooh!" (as Peppa Pig says), we didn't really have such a forceful and usually positive one. And I have the impression that it has filled a void in other languages too, e.g. "Wow, das ist klasse!" I wonder whether speakers of e.g. Arabic, Chinese, Hindi, etc. etc. have begun to use "Wow!" in their own language or whether they already have a word that is used in the same way.