There is a good chance that if you haven’t had to write a bio already, that you may have to in the future. A bio is required of many job applicants, it is used on many networking sites, freelancers have to have one for potential clients and if you have a website or blog connected to your business, you should probably have one. Bios provide a concise summary of who a person is and what they do, while at the same time, they allow a bit of personality to come through. There are basically two main functions your bio should perform: 1) establish your credentials and qualifications; 2) create enough interest so the reader will want to know more.
Develop a central theme, main idea or thesis that clearly explains the purpose behind your autobiography. For example, your theme might be about how you overcame obstacles to become a stronger person, or it might explain why a particular passion -- such as mountain climbing or rescuing animals -- is so important to you. Back your theme with details and background information about your life experiences. For example, you might explain that your dad is in the military, so you've had to learn how to adapt quickly to new schools and unfamiliar environments. Or, you might discuss what it was like growing up in a poor, single-parent home, but how your family was always willing to take in injured or stray pets.