A complete computer system is consisting of a number of hardware devices. These could be a Central Processing Unit, a Keyboard, a Mouse and a Monitor. These are basic components which makes a computer system complete. But if you consider this system thoroughly, you would realize that you are missing something. Keyboard and mouse are input devices whereas the monitor gives you display of your whole work. Is your work in the central processing unit (CPU) is of any worth without a hard copy of it? Definitely it does not hold any importance. Now you may have realized that you were missing an output device - a printing instrument.
Nowadays, a number of portable media have been invented for carrying data with you to your presentation venue. You can use flash drives which are available in unimaginable storage capacities. It is possible to take even a bigger file folder in this tiny device to any conference of presentation. There is also possibility to upload your data to some server of even to your personal email account. You can download this data as and when required at any place. But just imagine that you are going to give a presentation before executive members of a company. You take all your data in your flash drive or uploaded the same to your email account. You will use this data in your presentation.
But is it not necessary to give a copy of your work to those executive members for review and study? Definitely, it is most important element in any presentation. So you need to provide them hard copies of your presentation. For this purpose you need a printing device which can print your work and you will deliver one set of this hard copy to each member of the presentation. So it is proved that any computer system without a printing device is actually incomplete. In order to complete your computer system you will require a printing device.
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