Debug (command)
DEBUG is a DOS / MS-DOS / WINDOWS command. A computer programming tool for interactively examining memory contents (in binary, hex, or assembler), making changes, and selective execution. COM EXE and other files can be loaded into memory or saved from memory.
Traditionally, all computers and operating systems have included some version of this essential maintenance function, used by computer programmers to figure out why a program is not working right, by executing the program step-by-step and making small experimental changes.