What is computer ?

What is computer ?
                                A computer is a machine that can be programmed to accept data ,process data into useful information and store it for later use .a computer consists of hardware and software .The machine is known as hardware .The programs are called software .The processing of input to output is directed by the software but performed by the hardware. 

Components of computer   ?
                                           
1                           Input  Devices

2                           output devices

3                           processing Device

4                           Storage devices
     

Input devices .
                          The data that is given to the computer is called 
                          input .
Output devices  .
                         The data processed into useful
                                 information is called output.
Types of storage devices .
            1      Primary storage devices
             2     secondary storage devices