Callback Function in JavaScript?

A callback function is a function that is passed as an argument to another function and is executed later by that function.

Example:

function greet(name, callback) {
console.log("Hello " + name);
callback();
}

function message() {
console.log("Welcome to JavaScript!");
}

greet("Sathish", message);

Output:

Hello Sathish
Welcome to JavaScript!