Editorial Note: This article is written with editorial review and topic relevance in mind.
When we talk about a specific group of people, we consider it as singular and therefore, no need to add s. People is a collective noun. Peoples is used when we talk about two or more.
See PEOPLE's 50th Anniversary Cover Stars with Their First PEOPLE Cover
He was always energetic and positive and he was a people person. What is the plural of people person? A people person is someone who is outgoing and has good communication skills.