The accompanying figure depicts the four categories of input. They include data, programs, commands, and user responses. Briefly define input and each of the four categories

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ANSWER:
Input is what you enter into the memory of a computer.
Data is a collection of unprocessed items. A computer manipulates and processes data into information that is useful, such as words, numbers, pictures, sounds, and so on. Although a single item of data should be referred to as a datum, the term data commonly is used and accepted as both the singular and plural form of the word.
A program is a series of instructions that tells a computer how to perform the tasks necessary to process data into information. Programs are kept on storage media such as a hard disk, CD, or DVD. Programs respond to commands issued by users.
A command is an instruction given to a computer program. Commands can be issued by typing keywords or pressing special keys on the keyboard. A keyword is a special word, phrase, or code that a program understands as an instruction. Many programs also allow you to issue commands by selecting graphical objects. Today, most programs have a graphical user interface that uses icons, buttons, and other graphical objects to issue commands.
Sometimes a program asks a question, such as “Do you want to save the changes you made?” that requires a user response. Based on your response, the program performs specific actions. For example, if you answer Yes to this question, the program saves your file to a storage medium.

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