A more thorough explanation:

Definition: Res aliena (rays ay-lee-ee-n or al-ee-) is a Latin term that refers to property that belongs to someone else.

Example: If you borrow your friend's car, the car is considered res aliena because it belongs to your friend, not to you.

This term is often used in legal contexts to describe property that is owned by someone else. It can include things like land, buildings, vehicles, and personal belongings. When you use or borrow someone else's property, you are responsible for taking care of it and returning it in the same condition as when you received it.