They study weather and climate, help you text your mum when you'r abroad and now even North Korea have one. Satellites are the orbital gadget bundles that make modern communication happen.
Picture this: you're on your way across Antarctica and you snap your ankle. How do you get help? Satellite phone.
You want to spy on your neighbour or make a nostalgia search of a distant land? You tap Google Earth's satellite map.
Satellites were at the heart of the Regan-era Star Wars programme, which would have protected the US against missile attack during the height of the cold war.
Without satellites, the Lucas-inspired mockery of Regan's idea would not have been possible, and neither would your last international mobile phone call.