What does Idem mean?

It is usually natural when they read a book, research paper, thesis or thesis. You wonder what idem means, this word that is always located at the bottom of the page.
It should be noted that it means:
Idem: It is a word that comes from Latin, it means “the same”. And this word is used as an economical way and avoid redounding in writing the same reference already made, such as work, author's name and his page.
It is important that you know that adding the word idem to the footer is only done when another page is made within the same page. reference to a text or paragraph is placed on purpose and that it belongs to the same author of the same work and that it is located in the same page.
Many people can be confused if idem is placed after the data of another author and another work, because then they would not specifically identify who or what is being indicated. It is a rule that if it will be used it is because it will be placed in the lower part, because the correct data is already concentrated in the upper part.

Doubts may arise regarding its use, and it should be added that idem is usually widely used in tasks for research methodology, which are taught at high school and high school levels college. Since this subject helps the student to learn to carry out a correct written work, where they are used as in this case of idem, as a form of written communication to guide the reader to understand the reason for the information. In this way it is explained that it means idem, it is not an abbreviation or acronym, it is only a Latin word that means the same thing.
An example of what has already been outlined is:
Footer
? Saavedra, José. "Song of songs." 6th. Ed. Editorial Graphicos. Mexico. 2010. P. 134
?? Idem.