Bio/baɪəʊ,baɪə,baɪˈɑː/ Definition 1 of 4Pro Tip 1/3Personal Stories A bio shares personal stories making it engaging and often inspirational. His bio detailed his journey from poverty to success. Pro Tip 2/3Not An Autobiography Different from an autobiography, a bio is usually shorter and can be written by someone else. The bio on the author was concise and informative. Pro Tip 3/3Formality Range Bios can be formal or informal depending on the context and audience. Her formal bio was included in the conference brochure.