what is a thunderbolt device for this computer?
Thunderbolt is a revolutionary I/O technology that supports high resolution displays and high-performance data devices through a single, compact port. Thunderbolt is a hardware interface that allows for the connection of external peripherals to a computer. It uses the same connector as Mini DisplayPort (MDP). Thunderbolt combines PCI Express (PCIe) and DisplayPort (DP) into one serial signal alongside a DC connection for electric power, transmitted over one cable.