"Loving-kindness meditation (LKM) aims to develop an affective state of unconditional kindness to all people.
Compassion mediation (CM) involves techniques to cultivate compassion, or deep, genuine sympathy for those stricken by misfortune, together with an earnest wish to ease this suffering.
Both LKM and CM are centrally related to, and include the practice of, mindfulness, as noted by many scholars and practitioners from varying traditions, including Theravadin, Japanese, and Chinese Zen."
Hofmann FG, Grossman P, Hinton DE. "Loving-Kindness and Compassion Meditation: Potential for Psychological Interventions." Clin Psychol Rev. 2011 November ; 31(7): 1126–1132. doi:10.1016/j.cpr.2011.07.003.