The "final" keyword in the Java programming language is used to specify constants, prevent method overriding, and limit class inheritance.
The "final" keyword makes constants, which maintain a single value throughout the programme, by making variables immutable. Because final methods cannot be overridden in subclasses, their behavior is maintained. Furthermore, when a class is marked as final, other classes cannot extend it, giving the user control over the class hierarchy. The "final" keyword encourages maintainability of the code, upholds immutability, and permits safe and efficient code execution.