The term etymology is known to the discipline that deals with the origin of words, their incorporation into the language, sources and if their form and meaning have been modified.
In those cases in which the language dates back many, many centuries, scholars and experts in etymology can deduce and know the original meanings of some words, as well as if they have undergone any modification over the years. Because of course, just as we comment many times that the world and its inhabitants advance and change in terms of uses and customs, fashions, among other issues, the words they use also change and mutate, leaving some practically obsolete. For example, in some Spanish-speaking countries, such as Argentina, the word audition was used a few decades ago to refer to those radio programs or, failing that, television, however, it has been replaced by the most modern programs (radio or television) and of course, when someone pronounces the "old" hearing, the youngest, generally, do not understand how it is used and of course the person who uses it will show their age.
And just as some terms are becoming obsolete, there are others that, due to their recurrent use, get them included, for example, in the Dictionary of the Royal Spanish Academy.
Secondly, etymology is also concerned with noting those cases in which a certain language accepts and borrows some words belonging to other languages or lexicons and which will later become its own, losing, due to the regular and current use they receive, that foreign origin. For example, the Spanish language has been able to borrow from English the terms cocktail, leader and goal, from French, garden, souvenir, hotel, garage, from Italian, mask and blackboard, among others.
Meanwhile, the etymology is not only due to the knowledge of the origin of the Castilian language, such as a Neo-Latin language derived from the Latin that the Romans introduced and used around 206 BC, but also the etymology allows you to expand vocabulary and improve writing so as not to make spelling mistakes.
