The question "what is justice?", contained in the title of the book, is very old. It has occupied legal theorists and philosophers from antiquity to the present day. We could say that it is a question similar to the one Pontius Pilate addressed to Jesus Christ in the Praetorium: "What is truth?"

However, this book does not aim to continue the search for an answer, which may not even exist. The author's purpose here is much simpler: It consists of the effort to bring law and legal science closer to the ordinary citizen; to take law from the level of theory and bring it down to the reality of everyday life; to make it clear to the non-specialist what the rules of law mean and how they are applied every day in a multitude of issues (commercial, economic, family, inheritance, etc.) that arise from people living together in a community.

Although law is directly and inextricably linked to human daily life, it does not attract the same level of interest and trust as other social and political sciences, such as history, sociology, philology, art history, etc. With the ambition to reverse this image, the author tries as simply as possible and using many examples, to open a window for the non-lawyer into the "paradise" of legal concepts; to explain the functioning of many institutions; to simplify as much as possible legal constructs that seem obscure; and to make it clear that the legislator, although sometimes (or in some eras) may overdo it in the production of laws (hence our well-known over-legislation), generally does not act arbitrarily! Behind every legislative regulation lies the effort to solve everyday life problems and to settle conflicting interests of the members of society.