Sure, I can help you with that.

The main function in Java is always static. This means that it can be called without creating an object of the class. The main function is the entry point for all Java programs. It is where the execution of the program begins.

The `static` keyword in Java has two main meanings:

* It means that the variable or method belongs to the class itself, not to any particular object of the class.
* It means that the variable or method can be accessed without creating an object of the class.

In the case of the main function, it is static because it needs to be accessible without creating an object of the class. This is because the main function is called by the Java Virtual Machine (JVM), which does not create objects of classes.

You do not have to include the main function in your Java program, but if you do not, your program will not run. The main function is the only way to start the execution of a Java program.

Here is a simple example of a Java program with a main function:

```java
public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}
```

In this example, the main function simply prints the message "Hello, World!" to the console.

I hope this helps! Let me know if you have any other questions.
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