Ethics is a set of moral principles or values that defines right and wrong for a person or group

That statement is true

Ethics is indeed something that used by a social group to determine whats wrong and whats right.

Ethics could differ depended on the type and location of the social groups for example.

In middle east countries for example, it is considered unethical if women's clothing showed any form of skin while it is still considered ethical in western country

Smelly rocks sink in water haha!