The term "selfish" describes a behavior where a person prioritizes their own needs and desires over those of others. For example, if someone takes the last piece of cake at a party without considering others who might want it, they are acting selfishly. This attitude can lead to strained relationships, as people may feel neglected or unvalued. Being selfish isn't always a negative trait; sometimes, it can be necessary for self-care. For instance, a busy professional might need to say no to social events to focus on their health or work. However, finding a balance between self-interest and consideration for others is essential for healthy interactions.