Ethics (countable) are moral beliefs about what is right or wrong. Ethics (uncountable) is the study of this. The related adjective is ethical. Here are some frequent combinations:

Ethical behavior: doing things that are morally right
Ethical lapse: temporary failure to act in the correct way
Ethical dilemma: a choice between two actions that might both be morally wrong
Ethical standard: a rule for moral behavior in a particular area
Ethical stance: a stated opinion about the right thing to do in a particular situation
Ethical issue: an area where moral behavior is important

From Business Vocabulary in UseĀ 

Example Conversation Questions:

What are ethics (countable) in business? Can you think of some examples?
What does ethics (uncountable) mean?
What are the features of an ethical business?
Is ethical business possible in the modern world? Why?

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