A biography is a story that tells about someone's life. It's like reading a book about a person, but it's a book that tells all about what someone did and accomplished throughout their life.
Let's imagine that you are reading a story about a famous person, like a president, a scientist or a musician. The biography will start at the beginning, when the person was born, and then go through all the important events that happened in their life.
It will tell you things like where they grew up, what kind of family they had, what they liked to do when they were young, and how they grew up to become the person that you know about today.
The biography might also tell you about the person's achievements and accomplishments. This could include things like winning awards, writing books, or making scientific discoveries.
By reading a biography, you can learn a lot about someone you admire and understand more about what made them famous. It's a great way to learn about history and the people who helped shape it!