4. Conclusions
Public communication represents a system which functions according to a series of principles and which
is influenced inevitably by all evolutions in which the society is involved. It is being exposed to continuous
change and, why not, to corrosions. In the 21st century, the peculiar and main characteristics, which should define
this system, are represented by evolution; adaptability; and performance since all things, decided by the Public
Authority, has consequences over an important number of people in society.