Effective altruism (EA) is a 21st-century philosophical and social movement that advocates impartially calculating benefits and prioritizing causes to provide the greatest good. It is motivated by "using evidence and reason to figure out how to benefit others as much as possible, and taking action on that basis". People who pursue the goals of effective altruism, who are sometimes called effective altruists, follow a variety of approaches proposed by the movement, such as donating to selected charities and choosing careers, with the goal of maximising positive impact. The movement has spurred the creation of research centers, advisory organizations, and charities, which collectively have donated several hundred million dollars.