The "Expanding Circle" is a concept in ethics that describes how our moral considerations can grow over time. Initially, people may only feel a sense of responsibility toward their family and friends. However, as awareness and empathy develop, this circle can expand to include broader groups, such as communities, nations, and even all of humanity. This idea is often associated with philosophers like Peter Singer, who argue that our moral obligations should extend beyond our immediate relationships. The expanding circle encourages individuals to consider the welfare of animals, the environment, and future generations, promoting a more inclusive approach to ethical decision-making.