Empathy is the "intellectual identification with or vicarious experiencing of the feelings, thoughts, or attitudes of another" (www.dictionary.com). In other words, empathy is when someone is able to "put themselves in someone else's shoes," so to speak. There is a difference between sympathy and empathy. Sympathy means to feel sorry for someone and doesn't mean one necessarily tries to empathize. To empathize, you simply must think as the character might think, for example, when he/she is in a certain situation or predicament. Ask yourself, "How would I feel if I could step into this character's world? How would I react if I was this character?"