Okay kiddo, do you know what a detective is? They are the people who solve mysteries by looking for clues and investigating.
Well, the GNU Debugger or "GDB" is like a detective for computer programs. It helps programmers find and solve problems in their programs by looking for clues in the form of errors or bugs.
Just like a detective, the GDB can ask the program questions and inspect its "thought process" while it's running, to find out what's going wrong. It can even stop the program at certain points to look at what's happening in more detail.
The GDB works by attaching itself to a program and controlling its execution. It can help find errors in the program code and allow programmers to step through the program one line at a time to see how it's working.
So, in short, the GNU Debugger is like a detective that helps programmers solve the mysteries of their programs by looking for clues and investigating until they find the solution.