Greed is an excessive desire for wealth or gain, often at the expense of others. It refers to a strong craving for something, such as money, power, or material possessions, that goes beyond what is considered reasonable or healthy. Greed can lead people to make selfish and unethical decisions in order to acquire more wealth or resources than they need, often at the expense of others. It is a negative trait that can have harmful consequences for individuals and society as a whole.