Morality is a system of rules that modifies our behaviour in social situations. It’s about the doing of good instead of harm, and it sets some standard of virtuous conduct.
When asked about morality, people say “It’s just about your personal opinions” But if you look at the way in which moral values actually work in our everyday lives, you’ll see that this is not the case. Personal intuitions are important, of course. But morality generally comes into play when people interact with each other. This suggests that morality is a system of “shared” values which “justify” actions. As such, morality is about deciding on best courses of action in all situations. As you’ll see, there are quotation marks around the words “shared” and “justify” for a reason.
Moral values are generally shared values. If we did not have an values in common, it would be exceedingly difficult to agree on any one course of action. But since there is often disagreement as to what is the right thing to do in any situation, we can see that in fact, various values are shared to a greater or lesser extent. On some values there will be nearly unanimous agreement. On others, there may be considerable disagreement.
There are a number of moral values on which there is extremely wide agreement. For example, all cultures that I know of place value on truth-telling, and place strong restrictions on lying. As another example, all cultures of which I am aware have rules against doing unnecessary harm to other people. Other such shared values include (among many others) loyalty, justice, and promise- keeping.
There are many people who agree and disagree with the morality of others and we all have our own opinions about eachothers morals but it all depends on how we were brought up and what our beliefs are. This is what makes our Morals differentiate.