A D-shaped sub miniature pin that goes into the back of a computer and has two thumb screws on the side.
DB 25 Connector
A cable that sends data in ones and zeros in a straight line, but it can only send one bit at a time, which is measured at the speed of cables in bits per second.
Serial Cable
DB9 Connector
Known as full speed and runs at 12 megabits per second
USB 1.1
Known as high speed and runs at 480 megabits per second
USB 2.0
Known as super speed and is at least 5 gigabits per second
USB 3.0
Runs at 5 gigabits per second
USB 3.1 Gen One
Runs at 10 gigabits per second
USB 3.1 Gen Two
Runs at 20 gigabits per second
USB 3.2 Gen 2x2
USB 4