TheGNUDebuggerallowsyoutoseewhatisgoingon"inside"aprogramwhileitexecutes-orwhataprogramwasdoingatthemomentitcrashed.  GDBsupportsC,C++,Java,FortranandAssemblyamongotherlanguages;itisalsodesignedtoworkcloselywiththeGNUCompilerCollection(GCC).