2. Computer hardware is the collection of
physical elements that constitute
a computer system. Computer hardware
refers to the physical parts or components
of a computer such as
monitor, keyboard, Computer data
storage, hard drive disk, mouse, CPU
(graphic cards, sound
cards, memory, motherboard and
chips), etc. all of which are physical
objects that you can actually touch. In

4. Computer software, or just software, is any
set of machine-readable instructions (most
often in the form of a computer program) that
directs a computer's processor to perform
specific operations. The term is used to
contrast with computer hardware, the physical
objects (processor and related devices) that
carry out the instructions

6. In computing, an input device is
any peripheral (piece of computer
hardware equipment) used to
provide data and control signals to
an information processing
system such as a computer or
other information appliance.
Examples of input devices
include keyboards, mice, scanners, d
igital cameras and joysticks.

8. An output device is any piece
of computer hardware equipment
used to communicate the results
of data processing carried out by
an information processing system
which converts the electronically
generated information into human-
readable form.