What kind of thread is this and what is it used for! ?

This is a printer cable. One end is standard USB and the other is Type B USB. It is mostly used in printers, scanners, cash registers and other equipment.

This picture is a common USB interface diagram, from left to right:

miniUSB male port (type A plug), miniUSB male port (type B plug), USB male port (B Type), USB female port (Type A socket), USB male port (Type A plug)