Slingbox is a set top box web service that allows you to watch [and control] your television at home over any internet enabled device.
This is the dude on the website that explains how it works [and the title of this post].
[Did you know the Narwahl can grow a tusk up to 3 metres long? It looks a bit like a fishy unicorn, but its name is actually derived from the old Norse word for corpse because of its necrotic hue.]
It's a great use of comedy to deliver a potentially confusing / boring technology message. A spoonful of sugar and all that.