According to Wikopedia; "Business ethics is a form of the art of applied ethics that examines ethical rules and principles within a commercial context, the various moral or ethical problems that can arise in a business setting, and any special duties or obligations that apply to persons who are engaged in commerce. "
Business ethics is a huge issue these days, and has become part of the required curriculum at business schools. Most religions outline rules to follow in a business setting. While it is relatively simple to know the legal aspects of business, ethics is not always so clear cut.
There are many resources and discussions available. The Markuta Center for Applied Ethics of the University of Santa Clara has a page of links for organizations both nationwide and international.
Business is not just about making a profit. Ethics in business, as in life, are an extremely important part of human existence.