Ethics or moral philosophy is a branch of philosophy that involves systematizing, defending, and recommending concepts of right and wrong conduct. The term "ethics" derives , . The branch of philosophy axiology comprises the sub-branches of ethics and aesthetics, each concerned with values. 

Ethics seeks to resolve questions of human morality by defining concepts such as good and evil, right and wrong, virtue and vice, justice and crime. As a field of intellectual enquiry, moral philosophy also is related to the fields of moral psychology, descriptive ethics, and value theory. 

Three major areas of study within ethics recognized today are: 

Rushworth Kidder states that "standard definitions of "ethics" have typically included such phrases as 'the science of the ideal human character' or 'the science of moral duty'. Richard William Paul and Linda Elder define ethics as "a set of concepts and principles that guide us in determining what behavior helps or harms sentient creatures". The "Cambridge Dictionary of Philosophy" states that the word ethics is "commonly used interchangeably with 'morality' ... and sometimes it is used more narrowly to mean the moral principles of a particular tradition, group or individual." Paul and Elder state that most people confuse ethics with behaving in accordance with social conventions, religious beliefs and the law and don't treat ethics as a stand-alone concept.
what phrase does he use?
Rushworth Kidder states that "standard definitions of "ethics" have typically included such phrases as 'the science of the ideal human character'