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In order to know the meaning of the term focus it is necessary, first, to discover its etymological origin. In this case, we can state that it comes from Latin, specifically the word "focus", which can be translated as "home fire".

This concept has several uses: the first one that mentions the dictionary of the Royal Spanish Academy (RAE ) refers to a electric lamp whose light is directed at a certain point.

The foci, therefore, can be optical instruments that project the light Towards a specific area. There are spotlights in theaters, in movie and TV studios, in stadiums and in many other places.

In a broader sense, a focus is called a reflector or apparatus from which beams of heat or light rays come out. According to region , the term is used more specifically.

In some countries , focus is said to a Incandescent lamp . These elements are also called light bulbs , bulbs , light bulbs or blisters .

The front lights of cars and other vehicles, meanwhile, can be mentioned as spotlights in several nations . In other places, these lights are named headlights .

Other data of interest on the focus are the following:
-The one known as electric focus was created by the British chemist Humphry Davy (1778 - 1829), who, in addition, is considered the father of electrochemistry along with other illustrious figures such as Michael Faraday or Alessandro Volta.
- We had to wait, however, until that Swiss creation could really be used. And that was something that the American inventor and entrepreneur Thomas Alva Edison (1847 - 1931) achieved, which shaped other inventions such as the film camera or the phonograph.

It must be established that there are a lot of different models of spotlights. However, among the most significant we can highlight some such as the following:
-Asymmetric, which are those presented with the lamp located at the top or bottom of the bulb. They are suitable to proceed to illuminate large surfaces or even backgrounds.
-Minibrutos, which are currently disappearing and are made up of six to nine quartz lamps specifically 1 kW.
-HMI FRESNEL. These other lights have the particularity that they are widely used in the world of cinema for their great light output. Exactly they are very used in what are filming and recordings of scenes that are made outdoors.

If we focus on the terrain of the optics , the idea of ​​focus mentions the convergence point of the light rays . An image is in focus when the light of the points converges correctly; instead, an image is out of focus when the light is not properly converged.

Focus, finally, can be the imaginary or real site where something is concentrated and from where it spreads. Expressions as "Focus" and "Focus" they are also used symbolically with respect to the concentration of interest . For example: “With the development of the Soccer World Cup, Russia will be the focus of attention for sports lovers”, “The new tax law aims to focus on small businesses”, "Nutritionists focus on the consumption of fresh fruits and vegetables".

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