Computers have ports for almost anything, but not Thunderbolt, which is restricted to Apple devices and only the occasional non-Apple consumer electronic. Elgato has decided that that was cause enough to make a TB dock.
And not just any dock, but an all-in-one docking station that incorporates pretty much every interface that a PC has.
See, tablets, MacBook laptops and other mobile devices might not have as many I/O ports as you might need, especially if you and your friends have a whole bunch of connectable gadgets.
So Elgato has made the Thunderbolt Dock, which has a pair of Thunderbolt connectors, plus Gigabit Ethernet, an HDMI 1.4 output (can handle displays with resolution of up to 2560 x 1600 pixels resolution), and three USB 3.0 connectors. There's even audio jacks and a microphone input.
All in all, not bad for something that measures 178 x 80 x 25 mm / 7 x 3.14 x 1 inches. It's too bad that the price is so high, at $229.95 / €219.95.
At least the color scheme, black and grey, allows the product to fit into any room. So, say you have an all-in-one or Apple Mac system. You can connect your phone and headphones directly, but use the dock to hook up a portable HDD, a tablet and maybe a MacBook/Laptop at the same time.