The current epoch is characterized by the production and supply of new biomedical technologies, the supply of which has resulted in philosophical, ethical, religious and social debates and challenges. These biotechnologies include artificial fertilization and babies in vitro, animal and human cloning, obtaining fetus stem cells and exploiting them, euthanasia, the manufacture of human tissues and organs, and implantation.In view of these widespread questions, ambiguities and challenges in the area of biotechnologies, applied ethics as a branch of normative ethics has become responsible for supporting the examination and explanation of these subjects and for finding accurate answers about them on the basis of known moral theories and ethical principles.Hence, bioethics as a new sub-branch of applied ethics, in facing these debates and problems resulting from the emergence of new biomedical technologies, has developed in recent decades and has become liable for the explanation of the principles and guidelines for resolving those difficulties.In this essay, the author attempts to provide an inclusive and precise definition of bioethics and to describe its location between different branches of ethics as well as to delineate its scope and boundaries.