You can use “hey” and “hi” to greet someone instead of “hello”. Both are particularly popular among younger people. While “hi” is appropriate to use in any casual situation, “hey” is for people who have already met. If you say “hey” to a stranger, it might be confusing for that person because he or she will try to remember when you met before! You can also add “man” to the end of “hey” when greeting males. Some people also use “hey man” to casually greet younger women casually, but only do this if you know the woman very well. Remember that “hey” doesn’t always mean “hello”. “Hey” can also be used to call for someone’s attention.