Purim is a holiday of joy, celebration and feasting, but an essential element of Purim is giving, particularly to those in need. Mordechai established matanot le’evyonim — gifts to the needy — as a central commandment of the day. Jewish tradition and modern research alike show that generosity increases happiness and life satisfaction and activates “the happiness trifecta” of dopamine, serotonin and oxytocin. Engaging in giving transforms personal joy into shared joy, making Purim a celebration that uplifts both the giver and the community.