Thunderbolt

Thunderbolt is an I/O technology developed by Intel in collaboration with Apple Inc. It first introduced by Apple in its 2011 line of MacBook Pros and became the official replacement for FireWire and the standard above USB.

Form factors
Thunderbolt 1 can reach transfer rates of up to 10Gbps through an interface that looks like and is backwards compatible with Mini DisplayPort. Thunderbolt also can deliver Gigabit Ethernet through an adapter. Thunderbolt 2 uses the same connection form factor can reach transfer rates of up to 20Gbps.

Thunderbolt 3 uses the USB-C form factor and can reach transfer rates of up to 40Gbps. USB4 uses the same form factor and is basically the same as a USB-C port that supports Thunderbolt 3 signals. Thunderbolt 4 also uses the same USB-C form factor, but specifies a minimum bandwidth of 32Gbps for PCIe link, support for dual 4K displays, and protection against attacks.