Obrigatório
Obrigatório is an adjective in the Portuguese language that means "mandatory" or "required." It is used to describe something that is legally or officially required, or that must be done or followed. For example, "É obrigatório usar cinto de segurança no carro" translates to "It is mandatory to wear a seatbelt in the car." The term can also be used in a broader sense to indicate something that is necessary or essential, such as "É obrigatório estudar para o exame" meaning "It is necessary to study for the exam."
The word "obrigatório" is derived from the verb "obrigar," which means "to obligate" or "to compel." It
The opposite of "obrigatório" is "opcional," which means "optional." While "obrigatório" indicates something that must be