Which nonfiction genre is defined as a story of real peoples' lives told by other people

Answer 1

The nonfiction genre you are referring to is called biography. A biography is a detailed description or account of someone's life written by another person, encompassing various aspects such as their experiences, achievements, and influences. When the subject's life is summarized or analyzed in a shorter format, it is typically called an autobiography if written by the subject themselves, or a memoir if it focuses on specific aspects of their life.