Programs that are executed from a command line can combine commands using a technique called piping so that the output from one command is automatically used as the input for another.
Piping can be defined as a technique that is used to combine two or more than two commands, and in this, the output of one command acts as input to another command and so on. Piping can also be visualized as a temporary connection between two or more than two commands / processes / programs. The command line programs that perform the further processing process are called filters.
This direct connection between commands / processes / programs allows them to operate simultaneously and allows data to be transferred between them continuously instead of having to pass it through temporary text files or through the display screen.
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