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The word group derives from the Italian concept gruppo and refers to the plurality of beings or things that form a set , either materially or mentally considered. The term is used in different fields, as in the mathematics , the astronomy , the chemistry , the sociology , the computing and the music .

For mathematics, a group is a structure formed by a set , on whose elements a binary operation or internal composition law that meets certain algebraic conditions has been defined.

In astronomy, a group is called a small number of galaxies that are close to each other (for example, the Local Group where is the Milky Way ).

In the field of chemistry, the word group has two uses. On the one hand, it allows naming a column of the periodic table of elements . On the other, it is a functional entity which consists of certain atoms whose presence provides a certain property to the molecule (functional group ).

A social group it is, instead, a subset of cultures or of societies . The use of the term is very common in the sociology .

For users of Internet , a group is a type of site where there are forums and where members can exchange information.

Finally, we can mention that a group or band It is a group of people who interpret musical works. There are groups in all musical styles, such as rock, pop, jazz or blues, for example. The Rolling Stones and the Beatles They are musical groups.

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