"How the Internet Works"

What I have learned about the Internet is how it runs in mega bytes and these mega bytes run so fast and they are the reason why the websites we want to go on appear on our screen. I also know that they have secretive codes so that hackers don't hack you and read your messages. They do that by changing the message you sent by a specific amount of numbers in the alphabet and that changes your message to a code. Another thing that I learned was that when a signal is being sent they all may take different routes before appearing on you screen. So for example if you are waiting for an image to upload you basically need to wait for the whole image pixels to arrive before you can view the image. It crazy to know how you can use internet even when you are traveling you aren't even near a wifi hot spot and you can still use you internet!