Maybe you know, maybe you don’t, but every computer that is connected to the internet has an IP number. It’s basically an unique number like your mobile number when you include your country code. The current standard is IPv4, the problem is that they are running out of free numbers. As more and more devices have internet access, more and more IP numbers have to be available.
Of course a new standard is around the corner: IPv6. It’s actually ready to be deployed and it will allow a lot more unique numbers … much more. Etienne Cliquet made this one square meter origami to illustrate the possible density of numbers. Pessimists claim that there will be only around 1564 IP adresses available for each meter square of the Earth’s surface. So you don’t have to worry and you can keep on buying those internet connected gadgets.