Since you didn't give any choices, I will do my best to explain.
Assuming that the question is asking about how the blog is addressed over the network, it has a unique 12 digit number called an IPv4 Address. There's another variation which isn't as commonly used which is an IPv6 Address.
When you type in the blogs web address, you're just using a string to route you to the IPv4 Address. Think of the string of letters in your address bar as a mask, that's basically all it is.
I suggest learning and studying technology and the way a computer or a phone works and how it receives info. That way, you will be able to give the device something it won't handle...... I think....
Key-lock.........................................
When you synchronize computers and phones or other mobile devices, they exchange information between the two. To keep your files in Sync you could backup your devices and save everything to a cloud (internet storage). I can not think of another. Sorry.
Explanation:
the largest number you can write in binary using only 6 places or 6 digits