The Latin word variatio arrived at Castilian What variation. This is how the act and result of varying: change, alter.
The concept has multiple uses according to the context. In the field of genetics, the variation refers to the changes that are recorded in the genes of a species or a population.
Genetic variation is linked to evolution. The alternative forms of genes located in the same position on homologous chromosomes are known as alleles, whose expression defines various traits. If there are many alleles for a gene, one can prevail over the others and thus produce the natural selection. Therefore, genetic variation contributes to the Evolutionary process.
In the field of music, on the other hand, the variation refers to a altered repetition within the frame of a composition. It is a technique that leads to reiterate, with alterations, a rhythm, a melody or another element throughout the work.
The main theme, thus, is imitated in sub-themes. Those imitations they are known as variations.
For the math, the variations are subsets that have the same number of elements as the set in question, although with differences in the order or in a certain element.
The idea of variation is also used in the colloquial language to name a modification that makes it possible to make a thing different from what it was or what it usually is, transforming its characteristics, its shape, etc. It is also a registered change in something.
Suppose a person usually makes an apple pie with raisins (raisins). One afternoon, however, he decides to use prunes. This means that you entered a variation on the usual recipe.
Take the case of Gross domestic product (GDP) from a country. The GDP variation or GDP in the last decade, for example, it shows how the data has changed over ten years.