Could you explain what is meant by the interface Consumer in programming?

In Java, the Consumer<T> interface is a functional interface from the java.util.function package that represents an operation accepting a single input argument of type T and returning no result. Its main purpose is to perform some action on an object, such as printing it to the screen, changing its state, or saving it.

Example usage:

import java.util.function.Consumer;

public class ConsumerExample {
    public static void main(String[] args) {
        Consumer<String> printer = s -> System.out.println(s);
        printer.accept("Hello, world!");
    }
}

Here, accept is the only abstract method of the interface, which takes an object and performs an action with it.