Input (noun)

1. Information or materials fed into a computer or system.
2. The act of putting something into a system or machine.

Origin:

Early 20th century: from input, on the pattern of output.

Examples:

1. The computer system requires user input.
2. The input data was incorrect.
3. The input was entered by the operator.
4. The input was processed by the computer.
5. The input was used to generate the output.