We often consider moral questions. For example, you might consider whether it would be wrong to lie to a friend to avoid hurting their feelings, or whether it is right to support military intervention in a civil war abroad. One central question in moral philosophy concerns whether there are objectively right answers to such questions.
Moral objectivists say that there are. They hold that there are facts about what is right and wrong, and that these facts do not depend on what we or our societies think about right and wrong. For moral objectivists, the aim of moral thought is to try to discover these facts.