Altruism means unselfish concern for others.
Altruism comes under noun.
Synonyms : benevolence, charity,generosity, philanthropy.
Antonyms : selfishness, misanthropy.
For a person to be altruistic he need to help others without expecting any gain from it.
Mr.Ravi, who is a good author, are known primarily for his novels; most people are unaware of his many anonymous altruistic acts.