A device , from Latin gadget ("ready" ), is a machine or system that meets certain actions ; that is, it is "ready" to develop certain actions.
Departure, on the other hand, is the action and effect of going out or going out . This verb refers from one place to another, move from inside to outside or get rid of any discomfort.
These definitions help to understand the concept of output device , a notion that is used in the computing . The first thing to keep in mind is that the entrance exit It is linked to the interfaces used by the units of an information system to establish a communication: the input is the signal received by the unit and the output is the signal it sends.
A output device , therefore it is the one that emits a signal with information . In this sense we can mention the printer (which receives information from a computer and produces an output printed on paper), the display (displays the data on the screen), the headphones (emits sounds to be heard by a person) and the speaker (plays sounds to the environment).
For example: “My computer has several output devices since I need to have the information in different formats”, "For me, the printer is not an essential output device since I usually work in a network, without having to have a physical copy of the data", “It doesn't help me to have a computer without an output device”.
Among all the output devices, the most important and most widely used worldwide is the monitor; it is the component that allows us to visualize the information in an attractive way, easy to understand and (what most differentiates it from paper prints) lively. Users often forget that much of what they see on the screen when they use a computer or mobile device was made simply to facilitate their interaction with the data, with the truly essential, which could well be expressed with a fraction of the processing and memory.
Let us not forget that also in the 80s people were able to perform various tasks with the help of a computer, despite the abysmal differences they presented with current equipment; While it is true that the possibilities have expanded considerably, it is likely that most of the texts and payroll of calculation that are created daily, to name two types of very common documents, could be perfectly performed on a computer two or three decades ago.
The monitor is an output device for many basic in any apparatus, although it is an exclusive element, since it has no use for a blind person. For them there are two possibilities, which many use together, and which in turn represent two other output devices: voice synthesizers through speakers and Braille displays.
The first alternative is a tool that many operating systems bring included in its basic package and allows the user to hear the content that, otherwise, he would see on the screen: the text of a document, the results of an Internet search, the options of a menu, and so on. It is handled through voice commands, for which it is usually necessary to go through a calibration process, so that the program has the necessary information to understand the person's accent.
The Braille screens, also simply called electronic Braille devices, reproduce through a series of small mobile protrusions the textual content of the computer. While voice synthesizers are more useful for navigating through different windows and applications, surely reading a digital book is preferable through one of these screens.
Finally, it should be noted that some devices develop both operations (input and output), such as being a network card or a modem .