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When determining the etymological origin of the term key we have to make clear that it is found in the sum of two words belonging to different languages. Specifically, we have to make clear that it is the result of the union of the Latin word thecula, which can be translated as "small box", and from the Arabic term tagra, which is synonymous with "bowl."

A key is a button, part or device that allows to activate some function . The keys are present in numerous electronic or electrical devices and are usually pressed with one finger.

For example: “I broke a phone key”, “I can't find the key to erase on this keyboard”, “The front panel of my new car has so many keys that I can hardly remember each function”.

Among the many devices that have formed or are part of our life and that have keys we should highlight the calculators, mobile phones, TV controls, typewriters, ATMs ...

The logic of electronic devices indicates that the keys function as a electric switch With two contacts: one performs a function and the other performs the inverse function. If the key is pressed, the function is open; If the key is not pressed, the function is closed.

In addition to the physical or traditional keys, there are virtual keys that appear on touch screens. This type of keys usually appears in ATMs or ATMs, in which the user must press the screen to choose between different options (request the balance of an account, extract money , etc.).

The overpopulation of keys can generate problems for the user, who is disoriented by so many possibilities. That is why it is common for devices to try to show only the keys that are essential for their use.

In the field of computing , the keys are the pieces gathered in the keyboard that contain letters, numbers or signs. These keys allow you to enter information to a computer : “I want to buy a keyboard that includes the Ñ key”.

On any computer we have to make it clear that the keyboard consists of several clearly defined areas. Thus, there are the function keys, which are what allow you to directly perform a task; alphanumeric keys, which are those of letters and numbers; the number keys, which have the numbers arranged as in a calculator; and the special keys, among which are, for example, the arrow keys to move across the screen.

Some musical instruments, finally, also contain keys that, when pressed, emit sound: piano keys , the organ keys .

However, we cannot ignore the existence of another meaning for the term key that concerns us. Thus, for example, in Peru that same word is used to refer to an old woman.

In addition to all of the above, it is worth emphasizing that there are different colloquial expressions that use this term key. One of them would be to "give someone on the key". It is a verbal phrase that makes it clear that this person has been right when it comes to taking a specific action.

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