In the terms of redirection terminal is the generic name which is the display and the board.
They are actually the stream of the characters which many commands may treat as input / output.
They are standard input attach to the board.
standard output attach to the display.
standard error.
Standard error
use to redirect the input from the file
wc < test-04.sh
Take the input from the file and the standard input
cat - foo.
Takes the standard input and then from foo.
cat foo - bar.
Takes the input from the foo and then standard input and then
bar.
Standard Output
wc sample.txt > newfile.
cat newfile.
To append the contents of a file to the existing file
wc sample.txt >> newfile.