From the Latin word aidiāris, assistant It is a term used to qualify what helps . The action auxiliary, meanwhile, consists of provide collaboration or some kind of assistance .

Auxiliary, therefore, may appear as adjective or as verb . For example: “We have a vacant administrative assistant position: if you are interested, you can leave your resume at the reception”, “Can you go help my mother? I think he has problems with the cake ”, "A nursing assistant was injured by an explosion in the municipal hospital".
In certain organisms and Business , is called auxiliary to a junior employee (that is, in the hierarchical organization of the entity, it is located below other people). In this sense we can talk about Administrative Assistant , accounting assistant , nursing assistant , Pharmacy assistant , etc.
In the same way, we cannot ignore the existence of the so-called library assistant. This is an administrative position that is held in libraries, as the name implies, and is developed by people who have to deal with a wide range of activities, such as these:
-They perform database maintenance.
-They take care of what the bibliographic information is.
-Catalog and classify documents.
-They deliver and receive from the user the bibliographic material that had been lent.
-They take care of what are the requests for cards.
-They proceed to ensure silence and compliance with the rules within what is the reading room.
-They perform the general inventory of the library.
In the same way, we cannot ignore the existence of another profession that is that of flight attendant. It is also called the passenger cabin crew (TCP) and is one of the members of the crew of an aircraft that, where appropriate, will be dedicated to providing comfort to passengers as well as controlling the safety of the trip .
Hence the professional in charge of travelers having their seats, transporting their luggage properly, maintaining respect at all times for others. That without forgetting that they will ensure that travelers are well, because they know how to act in case of an accident, because the instructions given at all times by the captain are respected ...
In the field of education, an assistant is a teacher who replaces the head teacher when he does not go to his workplace due to illness or another reason. Teaching assistant is also called to the one who collaborates with the teacher in certain educational tasks (correcting work, looking for materials, answering the students' concerns under the supervision of the holder, etc.).
If we focus on the terrain of the grammar , we will find the auxiliary verbs . These verbs are used to form verbal periphrasis, passive voice or compound tenses. Auxiliary verbs, such as be and to have , provide aspectual or modal data: “The ministers are gathered at this time”, “Juan has already left the office”, “Tonight we enjoyed a great concert at the San Javier Theater”.