What does "No shipping" mean?

Hello Hikashop,
I am looking at Payment Methods > Paypal > Specific Configuration > No Shipping

Your help explanation says, "No shipping : If activated, PayPal will not prompt buyers for a shipping address."

I do not understand what this sentence means, because there are three options that can be "activated".
The Values to activate are:

2 : Required
1 : Yes
0 : No

I need paypal to prompt buyers for a shipping address, which option do I choose?

If I choose "Required", will this Require users to enter a shipping address via Paypal?
What do Yes and No mean?

Hi,

Here is what each one means:
2 Required -> prompt for shipping address, and require one
1 Yes -> do not prompt for shipping address
0 No -> prompt for shipping address, but do not require one