Everything we tell the computer is Input. Input is part of the machine processing cycle:
Data means the raw facts given to the computer.
Programs are the sets of instructions that direct the computer.
Commands are special codes or key words that the user inputs to perform a task, like RUN "ACCOUNTS". These can be selected from a menu of commands like "Open" on the File menu. They may also be chosen by clicking on a command button.
User response is the user's answer to the computer's question, such as choosing OK, YES, or NO or by typing in text, for example the name of a file.
The first input device we will look at is the keyboard. The image used on the next page to illustrate the various keys may not look like the keyboard you are using. Several variations are popular and special designs are used in some companies. Laptops have fewer keys. Tablets and smart phones have onscreen keys.
It's enough to confuse a person's fingers!
Ergonomic keyboards even have a different shape, curved to fit the natural fall of the wrists.