People

People is the irregular plural form of person.
Ex: Many people agree with me. Only one person disagrees with me.

Note: There is also a regular plural of person, persons, which is more formal and less common.
Ex: This law does not apply to young persons under the age of eighteen.

People can also be a singular countatble noun, meaning "a race or nation".
Ex: The Chinese are a people with a long and splendid history.

This use of people has a plural.
Ex: The peoples of Africa speak many different languages.

I hope this article helps. If you have any question, please leave a comment below.