This book is a summary of Peter Singer's thoughts on the application of the school of "utilitarianism" in the sphere of practical ethics. For years, as evidenced by his lectures and works, he has been troubled by widespread injustice, increasing poverty, and environmental destruction in the world. In his philosophical endeavors, he tries to find practical ways to improve the current situation. Ways to bring the greatest good to the greatest number of people, regardless of nationality, creed, profession, or any other boundaries drawn between them. His goal is to reduce the suffering of all, and in an era where capitalism and individualism are rampant, he is eager for kind hearts that are empathetically eager to do good. In this text, Singer has formulated the most important aspects of his philosophical framework in the form of a concept called "effective altruism." In this sense, he praises benevolence but outlines clear qualities, directions, and goals for it. In his view, charity, although inherently both a virtue and a moral duty, is not sufficient on its own. Charity must be continuous, useful, and effective. In such a way that our efforts ultimately bring the best results, both for ourselves and for others. In this sense, effective altruists are those who strive to bring the greatest good to the greatest number of people, without noticeably reducing their own well-being. Therefore, after meeting their own basic needs, effective altruists give to others from what they have and share their happiness and joy with them. There is no limit to this giving. The more, the better. However, this giving should not lead to pain and suffering for the givers. Because the ultimate goal is to reduce suffering, not create new suffering. The concept of giving in this system goes far beyond financial assistance and has many forms. For example, those who donate blood, bone marrow, or kidneys to patients in need have generously given a part of their body. Those who spend time with the elderly, visit the sick, or actively participate in environmental activities are also philanthropists. Even researchers who prioritize the collective good in their studies, regardless of their field or profession, have taken this path. Thus, freedom of choice of method plays a fundamental role in this theory. Everyone is free to define the type and level of their participation without any coercion or reluctance. For example, Singer praises both those who engage in effective altruism by living a simple life and those who take this path by finding high-paying jobs. The only red line is where we violate another moral principle with the aim of doing good. Otherwise, everyone can do their own share of benevolence and altruism. In addition, Singer does not just provide theoretical foundations and names dozens of successful philanthropists who have put this theory into practice. Those who spend a significant portion of their income helping the needy. Some of them are looking for higher-paying jobs, but not with the goal of accumulating wealth. Rather, more income gives them new opportunities for charity. According to Singer, trying to earn a lot of money to achieve a new ability to give is an inherently moral act. Because their goal is not selfish. Basically, in every decision they make, they consider their own needs as much as they do, and ask themselves how this decision can be a source of goodness for others. In this way, effective altruism becomes a way of life for them and its shadow is present in every decision they make. Effective altruists are people who love others - regardless of nationality, race, language, or any other line or boundary. Moreover, their compassion and love are not limited to human society and include animals as well. Singer writes about their unconditional love: “Effective friends do not trivialize or belittle the suffering of humans living in another country or of another race or religion. They believe that animal suffering should also be considered and generally believe that we should not give less importance to suffering just because it is inflicted on a non-human being.” (p. 48). Introduction to the author Peter Singer is one of the contemporary Australian philosophers and a well-known figure in the field of “practical ethics” and “bioethics” in the world. He was born in Melbourne and graduated from the Universities of Melbourne and Oxford. For many years, he has been engaged in teaching and research at several universities in the United States, Europe and Australia - including Princeton, Oxford and Melbourne - and has a fruitful and brilliant career. His most famous work is a book titled “Animal Freedom,” which he wrote 46 years ago (1975) and has been translated into more than twenty languages, including Persian. Behnam Khodapanah translated this book into Persian in 2017, which was published by Qoqnoos Publishing. Singer’s most recent work is “Effective Altruism.” Armin Niakan is the translato