Static methods are easier to call than instance methods because they don’t need to be called on an instance of the class but are called directly on the class name.
// if method is declared like this, you have to call it
// on an instance of the class
public void sendMail(String address, String subject, String body) {
...
}
// if method is declared static, you can call it on the class
// name itself (like a Class method)
public static void sendMail(String address, String subject, String body) {
...
}