Input-output (I/O) systems transfer information between computer main memory and the outside world. ... An example of such an I/O transaction is reading a block of data from disk to memory.

Why do we use input and output?

Input and output devices allow the computer system to interact with the outside world by moving data into and out of the system. An input device is used to bring data into the system.

What does an input output system do?

The basic input/output system (BIOS) is the part of an operating system that links the specific hardware devices to the software. It obtains the buffers required to send information from a program to the hardware/desktop receiving the information.