Morals are the principles of right conduct. In general, they are used by people toward living amongst other people. When everyone agrees to what is right, life goes along more smoothly. Governments use law to enforce morals, but civilization couldn't stand if individuals had no morals at all.
Sources of Moral Guidance
There are many sources of moral guidance used by many different groups of people; each groups sees their sets of morals as supreme. Western civilization in general is largely based off of the Ten Commandments (and to a wider extent the Bible), the set of morals for Judaism and Christianity. Muslims derive their morals from the Koran, another widely used source of moral guidance.