An administrative act represents a decision by which a public legal body, within its powers, decides on a specific administrative matter regarding the legal interests of an individual in a legally prescribed procedure. The essential features that define an administrative act are authoritativeness, one-sidedness, concreteness, legal action and attachment. The adopters of an administrative act are defined in the Law on General Administrative Procedure (five adopters are defined). According to the types of administrative act, act is classified in seven ways (constitutive/declaratory, by official duty and at the suggestion of the party, positive/negative, individual/general, legally bound/discretionary, simple/complex, decisions/conclusions). Furthermore, the Law on General Administrative Procedure prescribes the form and constituent parts of the administrative act (heading, introduction, sentence, explanation, instruction on legal remedy, handwritten signature, official seal/electronic seal). Due to the misunderstanding of the institutes of finality, finality and enforceability in legal practice and legislation, they are presented in more detail with regard to their procedural meaning.