Propagation a realy big word, to explain a seamingly easy process. So you have been made to think.
In reality it’s probably far from easy, and furthermore far from not complex. That being said, it kida works like this:
*The above is not exact but a general explanation of how in general propagation works. The idea is the changes flow from the top to the bottom like a long winding river. That kept in mind, the servers them self may not update for up to 48 hours regardless of where they are in the flow.
So basically when you tell the internet where your site lives, the internet as a whole must understand that, and that is what causes all of that. A lot to take in I know. But it is the reality of what occurs. All things considered it really is a fast process relativity speaking.
The main hold up on that, is not all of the servers that pick up your changes pick that up right away, because of how the servers them selves are set up. Some are set up to take updates every few minutes, to every few days. Why ISP’s(Internet Service Provider: The company that brings the internet to your home/office/cell phone) do this I have no idea, but the important thing to remember, is they are not going to accomidate you to make that faster.
So in a nutshell it’s going to take up to 48 hours weather we wish it to or not. So plan ahead when you are setting up your advertisements, and what not, because you might find yourself hurrying up, just to wait.