Pity is an attitude when one empathizes with another's sadness.
Pity is also called compassion or sympathy.
Pity is an emotion which branches out from sadness that is caused by sympathy.
People feel pity when they hear another's unfortunate story. Pity is an emotion of sympathy for the other's misfortune.
People try to help an unfortunate person when they feel pity. For example, people weep with the person in sympathy, gently put their arm around the person's shoulders, or silently stay with the person.
Usually emotions directly spread to others. However, since sadness is unpleasant if it spreads as it is to another person, people would avoid the person who feels sadness. So pity occurs as an emotion exceeding the pleasure or displeasure.
Pity enhances the cooperation in a group. Pity is an emotion that branches out from sadness, it can be called an emotion that connects love's behaviors with a sad situation.