Thunderbolt is a connection technology for transmitting both image and data signals in one and the same cable. Over time, the Thunderbolt standard has evolved from using connectors of the same type as the Mini Displayport (Thunderbolt 1- and 2) to now with USB-C connectors (Thunderbolt 3).
The great advantage of Thunderbolt connections is that you can connect a Thunderbolt docking station/hub or monitor with just a single cable. Eg. for fast connection at the desktop workplace for the laptop, where the fixed connections to peripheral devices (monitor, keyboard, network, etc.) are connected to the dock. This is the same as for USB-C hubs and docking stations.
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