As the very term suggests, loving - kindness includes the traits of love and kindness. It involves kindness, that is, taking a personal interest in others and showing that concern by helpful deeds and thoughtful words.
प्रेमदया या शब्दावरूनच समजते, की त्यात प्रेम आणि दया हे दोन गुण समाविष्ट आहेत.