Typical features of a debugger include:

* the ability to [[Disassembler|disassemble]] code

* the ability to execute single instructions or lines of code (single-step)

* the ability to stop execution at a requested location in the program (breakpoint) or when a variable changes value (watchpoint)

The GNU debugger is named "gdb" and has a command-line interface. Various graphical front-ends are available.