CMD - Command
Usually a windows system is run by a command prompt in DOS Mode. There are series of command that makes you work easily on a DOS based system. For a windows system, you can easily go to command mode by typing "CMD" in the "Run" window and press enter.
Command mode is usually a black screen which is a DOS based environment. To get the list of all the command possible in the DOS mode, type HELP followed by enter.
Some of the commands (CMD) of DOS mode are:-
MKDIR - Creates a directory
DIR - Displays a list of files and subdirectories in a directory.
MOVE - Moves files and renames files and directories
DELETE - Deletes one or more files.
REN - Renames a file/directory or files/directories
CD - Changes the current directory
COPY - Copies one or more files to another location
PING - To help determine network related problems