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

Biography.

The nonfiction genre that is defined as a story of the real people's lives told by other people is called a biography. A biography is a written account of a person's life, typically written by someone else, highlighting the individual's experiences, achievements, and sometimes struggles. It provides an in-depth and comprehensive look into the person's life and can often offer insights into the historical, cultural, or social context of the time period in which they lived.