Redirection allows the user to redirect standard input and standard output.
Standard input is input coming from the keyboard.
The user can request that a file be used as input instead of the keyboard. Standard output is writing to the screen. The user can request that output be sent to a place other than the screen, such as a file or the printer. Redirection is very useful, especially in batch files or debugging problems. Explain the terms standard input, standard output, and standard error.