A biographical book is a written account of a person's life, detailing their experiences, achievements, and challenges. These books often explore the subject's background, family, education, and significant events that shaped their character and career. Biographies can cover a wide range of individuals, from historical figures like Abraham Lincoln to contemporary icons like Oprah Winfrey. Typically, biographical books are based on thorough research, including interviews, letters, and other primary sources. They aim to provide readers with a deeper understanding of the subject's impact on society and culture, making them valuable resources for both education and inspiration.