If you see a stranger getting beaten up on the playground and you rush in to rescue them, you have done something unselfish to help another person, otherwise known as an act of altruism.

Use the noun altruism to refer to feelings or actions that show an unselfish concern for other people. In science, altruism refers to animal behavior that could be harmful to the animal itself but that contributes to the survival of the animal group. It's related to the adjective altruistic. Someone known for their altruism is an altruist.

Definitions of altruism

n the quality of unselfish concern for the welfare of others

egocentrism, egoism, self-centeredness, self-concern, self-interest
concern for your own interests and welfare
Type of:
the quality of not putting yourself first but being willing to give your time or money or effort etc. for others

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