"Peoples" is the plural of "people." It refers to different groups of people within a geographic region, in order to differentiate them based on culture and/or ethnicity. (Example: the native peoples of Canada) One person. Two people.

The word ‘ peoples ‘ is used as the plural form of people to refer to groups of people belonging to different nations, tribes, or communities. Peoples is used to distinguish between ethnic groups within the same cultural or geographical context.

So, technically, peoples is the plural of the word people, making it a type of plural on a plural. Don’t worry too much about the details. The key to getting it correct is understanding whether you are using the possessive of the word people or the word peoples — we’ll see how that works, next.