A value is a principle that you bleieve is important in your life and that guides your actions. Most people have values in order to help them act morally.
An example of a value I have is honesty. I believe that a person who lies is acting in an immoral way, and therefore, I always try to be honest. An example of this happened when I forgot to finish writing a paper for a class. Instead of lying about it, I told my teacher the truth and accepted the punishment.
Another example is that of perseverance. When I joined the volleyball team, I was very bad at it, and my team was unhappy because of it. However, as I worked harder, I was able to improve, and my perseverance paid off when we began to win games.