You see a link, you click on it, and it takes you somewhere. Simple, right? But actually, that remarkably straightforward user experience has a fairly complex series of computational processes going on in the background.
In this video, Dr Richard Mortier essentially explains the basics of how links work. He does a pretty great job of explaining the technicalities of the process in a fairly straightforward manner. If you don't really know your DNS from your TCP, you soon will. [Computerphile]