Courage is not fearlessness but the willingness to face fear. One example of true courage is sticking by your friends when the odds seem impossible. It is that feeling that comes to you when you just know everything is wrong but you want to make everything right. If someone criticized your friend, even if it were true, you might want to back him or her up because you'd expect him/her to do the same for you.
If I witnessed a puny boy getting beat up by a big bully, I would help the puny boy and tell the aggressor to stop and what he is doing is not right. A person who is courageous in the face of ethical challenges does the right thing even when it's not popular. That person refuses to stand by idly while others engage in an unethical or harmful behavior. I often meet people who don't do those things.
Sometimes, even I tend not to do something because it is not popular but the truth is that I shouldn't care whether it is unpopular or popular. If I feel that it's the right thing to do, I should do it. A breakdown of courage consists of cowardice and fearfulness. Many people become cowards at critical times which make them lose their courage.
Courage can be understood in two ways. Physical courage is the willingness to face serious risk to life or limb instead of fleeing from danger. Also, courage is the quality of mind which enables one to encounter danger and difficulties with firmness or without fear. You can show physical courage, but that doesn't mean you have the mind to be courageous at heart. Even if you can fight off a really big thing, that doesn't make it true...