The document discusses altruism, which refers to selfless concern for others without expecting personal gain. There are different types of altruism like reciprocal, pure, environmental, and heroic altruism. Examples of altruism include helping strangers, random acts of kindness, volunteer work, and donations. Altruism benefits both the recipient and the person performing the act through reduced stress, improved mental health, and increased empathy. Neurologically, altruism activates reward centers in the brain by releasing feel-good neurotransmitters.