Hi Nazmus,
Thank you for posting in Community.
Universal Serial Bus (USB) Host Controller is an interface or driver that allows an enables a piece of hardware for e.g your flash drive, Ipods, mouse, keyboard etc to interact and communicate with your PC. The
USB connection has an input and output port that comes standard with most computers and a variety of other digital equipment that allows data to be transmitted through a cable or any other form of direct connection.
Hope this information helps