Originating in Latin referens, the concept of reference refers to act and consequence of pointing or referring to something or someone . The verb refer, meanwhile, allows mentioning the act to make known a certain thing; organize or conduct something to a certain end; or put something in relation to another object or with a person .

By reference, therefore, a narrative is understood, information , data or news that indicates something or the link, relationship, dependence or similarity of one thing with respect to another. For example: “I have the best references about this movie”, "The president believes that the attack has no reference to the events that happened last Wednesday", "Excuse me, but we have no references about it".
In this sense, a reference is used to relate one topic to another, to offer bibliographic elements such as the author, the title, the date of publication, etc. with the aim that whoever reads said reference can obtain a unique identification and access the work in question without any problem and with total certainty that it was she who mentioned the book. There are specific fountain pens that serve to make this appointment, so when you want to make one of them, it is necessary to consult them to make a successful call, which any reader can understand.
In this same idea, a cross reference it's a call that allows the reader access more information about the topic you are reading. It can take you to other chapters of the same work or to a different book, so that you can expand the idea about what you are talking about, without making a complex mention of it on that precise page.
Some of the ways in which a cross-reference is indicated are: With a "V" (see), with "Cfr" (face) and other marks that allow the reader to resort to another section, chapter or work to delve into information.
It should be noted that the reference can also be the basis of a measurement or comparison: “You have to solve the equation according to the reference angle”, "To create the model, you can take this picture as a reference", “I tried to build the cage for the canary with the reference of the box, but it has not been well”.
In a text, the reference is a indication or call that cites the place, either from the content itself or from another source, to which you wish to refer readers : “You have to look at the reference on page 40 to interpret the drawing”, "The report is somewhat confusing: there are too many references to other research".
In the business world, it is also known as a reference to report that indicates the solvency or quality of an individual or company , which is usually given by a third party: "Call Dr. Nelson Pipis and ask for references about the Gortuzoy Brothers company", “They have given me the best references about your person: it will be a pleasure to work with you”.
In psychology, within the definition of the disorder schizotypal personality there is one of the manifest attitudes in a patient who suffers from it, which is known as reference ideas; This refers to the fact that for this disease to be diagnosed, it is necessary for the individual to make incorrect interpretations of certain casual incidents, making them extremely relevant to him.
This disorder is characterized by presenting a social deficit caused by an important anguish that reduces the individual's abilities to relate to their environment.
In programmingpass one reference to an object or variable as a function parameter It means allowing the original to be modified, as opposed to providing you with a copy to take your content as a guide.