Satellite TV is delivered, as the name suggests, via a satellite that is installed at your property. With Sky TV you get access to hundreds of free channels as well as premium channels like Sky Sports, Sky Movies and on-demand services. On demand gives you access to a whole library of box sets and other programmes available for you to watch whenever you want.
As well as this, Sky offer their on-line services called Sky Go, giving you access to their service whilst you are on your phone or tablet.
As with most deals, you will often find you get the best value for money if you choose one provider, e.g. Sky, to provide your broadband, digital TV and home phone line.