The term "immutable" refers to something that cannot be changed or altered. In computer science, for example, an immutable object is one whose state cannot be modified after it has been created. This property is useful in programming because it helps prevent unintended side effects and makes it easier to understand how data flows through a system. In everyday life, the concept of immutability can apply to certain laws or principles that remain constant over time. For instance, the laws of physics are considered immutable because they consistently govern the behavior of matter and energy, regardless of external conditions.