other than the internet? hmm... cellphones. I grew up in a world where telephones were bulky devices stuck to the wall, or on a short cord, and to call anyone outside of your local area you'd be charged a per-minute fee.
now - cellphones are basically supercomputers in our pockets where you could theoretically call anyone on the planet, if only you knew their number - and everyone has one.
next up is IoT, where everything is connected to everything else, in near real time.