The plural form of a word is the form that is used when referring to more than one person or thing
kind/type/sort of person David
In modern English, it is considered more formal and mostly used in contracts
I would say that these days, using
S
This has been so since person came into Middle English in the late twelfth century
And The New York Times Manual of Style and Usage now also states “Use people as the plural of person,” although they add that persons may still be used in certain settings (“letters to the editor, in untranslated texts, in direct quotations and in a few established idioms like displaced persons and missing persons bureau”)
If we can replace the subject with the pronouns “him,” “her,” or “them,” then “whom” is the correct form
Plurals of nouns are used to indicate when there is more than one person, place, animal, or thing
As you have said, we can also use peoples to talk about different groups within a nation or the world