Because we can speak with other people from different countries. Remember, in English: -“the” is only used with definite objects. Since you’re talking about people in general, and not a specific (definite) group of people, you don’t need to use “the”. -We don’t need to make adjectives agree with the nouns they modify. So, even though “people” is plural, the word “other” doesn’t need to be. -The word “different” is always followed by the plural. I hope this helps!

Vous avez raison !