Bugs are mistakes in code. A bug can make a program work incorrectly or even crash a computer. So, debugging code is one of the most important tasks that programmers have to tackle! This accessible, at-level book teaches readers about debugging and how it's crucial to their everyday digital activities--such as playing their favorite computer games. Readers will especially enjoy the photographs of young programmers like themselves at work as well as learning about two famous programmers--Grace Hopper and Alan Turing--and how what they accomplished through their knowledge of coding.