A computer is an electronic machine that accepts data, stores it, and processes the data into information. The computer processes data through an input device and produces output information. Common types of computers are super computers, mainframe computers, and personal computers, with personal computers being the most commonly used type.

1. A computer is an electronic
machine that accepts data , stores
and processes into information
.when data is entered into the
computer , the computer processes
the data to produce information
which is output.

3.  1) super computer – the fastest, largest , most
powerful and most expensive computer
 2) main frame computer – this is a little smaller
and less powerful than the super computer, but
,like the super computer it is also expensive
 3)personal computer – this is the computer that
most people use in their daily lives. This
computer is much smaller , less powerful and
less expensive than the super computer and the
main frame computer .

4.  Input : information and programs are entered into the computer
through input devices such as the keyboards , disks, or through
other computers via network connections or modems connected
to the internet. The input device also retrieves information off
disks.
 output : output devices displays information on the screen
(monitor) or the printer and sends information to the computer .
they also display messages about what errors may have occurred
and brings up message or dialog box asking for more information
to be input . The output devices also saves information on the
disk for future use .
 Processing : The CPU or central processing unit is sometimes
called the control unit and directs the operation of input and out
devices . The co processor or arithmetic logic unit does arithmetic
and comparisons . The memory or RAM temporarily stores
informations( files and programs) while you are using or
working on RAM.

5.  Hardware : Physical components that make up
a computer system .
 Software : Computer programs and related
datavthat provide the instructions for telling
computer hardware what to do and how to do
it .