He administrative law it is the branch of right who takes care of the regulation of the public administration . It is, therefore, the legal system regarding its organization, its services and its relations with citizens.

In this way, any person who, for example, in Spain chooses to occupy a position as administrative or administrative assistant within a public institution or entity is in need of acquiring all knowledge about the pillars, sources, functions and fundamental laws within the aforementioned administrative law.
Specifically, this will lead to training in administrative acts and their different types, the normative hierarchy, the regulations and their classes, the principles of administrative organization, the principle of normative competence, the principle of non-derogability of the regulations or bodies peripherals of the administration.
It is also essential that you learn everything related to administrative law and its facet of legal system. In this sense, it is vital that you discover that in a procedure within that scope the administrative bodies can never take part in it if certain circumstances come together.
More precisely among these circumstances are having some kind of personal interest in the matter in question, having some kind of professional relationship with the person directly interested in the subject, having kinship relationships with that or even having intervened in the procedure as a witness.
Administrative law can be framed within the internal public law and is characterized by being common (It is applicable to all municipal, tax activities, etc.), autonomous (has its own general principles), local (is linked to the political organization of a region) and exorbitant (exceeds the scope of private law and does not consider a level of equality between the parties, since the State It has more power than civil society.)
In addition to all of the above, we cannot ignore the fact that administrative law has certain sources. These can be of very different typology. So much so that we find written or unwritten sources, primary or secondary and even direct or indirect.
The origins of administrative law date back to century XVIII , with the liberal revolutions that eventually overthrew the so-called Old Regime . The new political systems contemplated the existence of abstract, general and permanent legal norms to regulate relations between the State and citizens. On the other hand, the new order involved the development of institutions for the control of the State, which was no longer in the hands of an absolutist monarch.
At present, administrative law applies to all organs and institutions through which the public administration acts. These bodies have powers superior to those available to individuals (the imperium). Administrative law is responsible for acting on administrative bodies when they act using their public powers (that is, using the power of imperium that breaks the equality between the parties).