If I were explaining this to someone I'd say we'll get to it later for now you need to know that the way to run your program is to use :
public static void main(String[] args) {
...
}
Assuming he/she knows what an array is, I'd say the args is an argument array and you can show some cool examples.
Then after you've gone a bit about Java/JVM and that stuff, you'd get to modifiers eventually to static and public as well.
Then you can spend some time talking about meaning of these IMHO.
You could mention other "cool" stuff such as varargs that you can use this in later versions of Java.
public static void main(String ...args) {
//...
}