Interfaces in Java

Interfaces in Java are abstract types that define a contract for classes to follow without providing the implementation details. An interface can contain method signatures, which must be implemented by any class that claims to implement the interface. Java interfaces support multiple inheritance, meaning a class can implement multiple interfaces, which allows for greater flexibility in design. They are commonly used to define common behaviors across unrelated class hierarchies. Interfaces enable loose coupling in software design, promoting more modular and maintainable code by separating the "what" from the "how."