USB 2.0
The USB standard has max speed 480Mbps and is referred to as Hi-speed
USB 3.0
The USB standard has max speed 5 Gbps and is referred to as super speed
Thunderbolt
A combination of PCIe 2.0 x4 and Display port technology is primarily used for video transmission, but can be used by other peripherals as well.
DDR3
Comes in 240-pin DIMM and 204-pin SODIMM
DDR4
Come 288-pin DIMM and 260-pin SODIMM
DDR5
Come 288-pin DIMM and 262-pin SODIMM
Hard drive speed
5,400 rpm, 7,200 rpm, 10,000, rpm, 15,00 rpm