Sympathy for another coupled with a desire/action to help.
In stories, the presence and absence of compassion reveals the inner nature of both the (un)compassionate and the object of their compassion. Characters who lack of compassion have No Sympathy for others, and tend think It's All About Me instead. Those who show compassion are usually The Heart of a group, though again, since compassion is born from sympathy, anyone is capable of demonstrating it. On the flip side, characters who are met with only callousness, bullying or suspicion are pushed to extremes which can manifest as turning to villainy... or forgiving their accusers of their ignorance and trying to change their minds through heroism. Showing a villain or mook Compassion can induce a Heel-Face Turn as they find someone willing to look past appearance/sins and see someone worth caring for... or it can backfire horribly like the parable of The Farmer And The Viper, proving that you should Pay Evil unto Evil. Heroes with bad PR (or Anti Heroes in general) may change their mind about helping the Adventure Town full of hostile locals if it has a single Good Samaritan willing to help them when they're down. The power of compassion is a lot like The Power of Love; a compassionate character can reach another who is considered too far gone to help and bring them peace through a well articulated speech and Cooldown Hug. The speech is usually focused on what they got the least of, such as You Are Not Alone for the Loner, or You Are Better Than You Think You Are to the downtrodden. Even villains are capable of compassion, and may gain the undying loyalty of minions through it. See also Did You Think I Can't Feel?, Video Game Caring Potential and Cry for the Devil. Contrast No Sympathy. Compare Pitying Perversion.
Examples:Film - Animated