Explaining Youtube in the Middle Ages

So I was daydreaming just now, and thought about how I would explain computers, the internet, and all that to someone from the middle ages, and not to sound patronizing to someone who may be smarter than you are, in spite of the time difference. I kind of got caught up with it, and here's what I came up with:

In the future, we discover a property known as electricity, a sort of miniature lightning, a spark which persists in metal and can be transmitted through drawn wire. Using these sparks, and their absence, we can create a system to codify information, like a grid of candles which, when snuffed in the right order, can spell out a word or make a simple picture. This binary code, named for the two simple states which can be occupied at any one time, has been standardised over the years, resulting in a complex mathematical method for encoding and transmitting any sort of information, using organizational tables and pre-approved registers to translate the pulses of sparks into whatever they might represent. Using a device called a transistor, we can create systems to approximate logical actions and decision-making in order both to store these tables in vast quantities and reference them very quickly. We call these machines computers.

The internet is simply a system of many such computers which use copper wire to send pulses to one another, enabling information to pass from one area to another quickly and efficiently, without any message being physically transported. By transmitting many images with small differences and displaying them one after the other, we can trick the eye into seeing fluid motion on what appears to be a moving picture. This process is freely and easily available to anyone and, like any trade, transmitting moving pictures attracts many competitors. The best-known and most widely used is called YouTube.

And we use it to watch cats jacking off.

Awesome.