Introduction to

 
Key Terms
Binary Digit: a single digit number in base-2, 
in other words, either a 1 or a zero. It is the 
smallest unit by which a computer data is 
represented.
Browser: a software that is used to access 
various kinds of Internet resources.
Byte: a set of Bits that represent a single 
character.

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Unit 0: Pre-Assessment
17
What is a Computer, Computer Science, Information Technology and Information and 
Communication Technology? 
1 What is a Computer?
A computer is defined as an electronic device designed for storing and processing data, 
typically in binary form [2].
The following are components of a computer system is composed of:
a. 
Memory or Primary Memory: enables a computer to store data or information 
and programs temporarily.
b. 
Secondary or Mass storage device: enables a computer to permanently store 
large amounts of data. Commonly used mass storage devices include disk drives 
and tape drives.
Input device: 
users interact with a computer using input devices. Input devices usually a 
keyboard and mouse are used by a user in order to provide instructions to a computer.
Output device: 
computer uses a screen or monitor, printer, or other device to display 
outputs.
Central processing unit (CPU):
the brain of the computer, this is the component 
responsible for executing instructions.
2 What is Computer Science?
There are several definitions for the term Computer Science most of them converge to the one 
given here. Computer Science can be defined as the study of computers and computational 
systems. Computer scientists deal mostly with software and software systems; this includes 
their theory, design, development, and application .