My African friend Mutale in Morocco, wants to have a Skype video chat with his friend Kasonde in Angola, although they are in the same continent the signal will travel to Skype data center back and forth in order to establish the connection.
I'm working on an international project with my friend Smari in Iceland and my friend Yon in Japan. I will use Facebook in order to contact them both. The signal will travel from me to Facebook data center and from there to Iceland and to Japan.
The data of any email I send through Gmail visits first Google's Data Center and from there it's been sent to the receiver.
Whenever somebody enter a domain of a website to visit using Tor browser, the IP address will bounce in different servers all over the world in order to make your visit anonymous. It will jump around until it finds the website and just around until the date will be transferred back to you.