Folks read for all sorts of reasons. For most of us, our earliest reading is purely for fun.
As toddlers we look at picture books, those with vivid art and simple stories. When we start school, we learn to read basic words and simple sentences. We progress to short “chapter” books, with more complex stories.
We continue our education with more complicated instructional texts. Entering adulthood, we often read for three reasons: to be entertained, to follow a set of “how to” instructions, or to learn something that can improve our lives.
The lesson: What makes good biographies so popular is that they teach through example. We read about famous people who’ve accomplished much or helped others, and we can use their lives as role models.