INTRODUCTION
A computer is a programmable machine designed to perform
arithmetic and logical operations automatically and
sequentially on the input given by the user and gives the
desired output after processing. Computer components are
divided into two major categories namely hardware and
software. Hardware is the machine itself and its connected
devices such as monitor, keyboard, mouse etc. Software are
the set of programs that make use of hardware for performing
various functions.
After going through this lesson you would be able to:
familiarise yourself with characteristics of computers
identify the basic components of a computer
explain the importance of various units of a computer
differentiate between system software and application
software
explain the importance of operating system
get acquainted with open source
appreciate the need of computer security
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