An interface is a point where two systems or subjects meet and interact. In technology, it often refers to the way users communicate with a computer or software, such as through a graphical user interface (GUI) that includes buttons and menus. This makes it easier for people to use complex systems without needing to understand the underlying code. In programming, an interface defines a contract that classes can implement. It specifies methods that must be included, allowing different classes to work together seamlessly. For example, a vehicle interface might require methods like start() and stop(), ensuring that any class representing a vehicle can be controlled in a consistent way.