Altruism refers to the motivation behind actions undertaken for the benefit of other people. However, non-altruistically motivated actions can still be good (e.g. people pursuing non-rival goods), and altruistically motivated actions can still be bad (e.g. people being mistaken about what is good).
Related tags and wikis: Shut up and multiply, Fuzzies, World Optimization, Effective Altruism, Cause Prioritization, Motivations, Psychology of Altruism, Ethics and Morality