Dear Dr. Norizan,

Based on some of references, I have find out definition for the concepts below.
Information Technology
Information technology or IT refers to the use of computers and software to manage information.In some companies, this is referred to as Management Information Services (or MIS) or simply as Information Services (or IS). The information technology department of a large company would be responsible for storing information, protecting information, processing the information, transmitting the information as necessary, and later retrieving information as necessary.
http://jobsearchtech.about.com/od/careersintechnology/p/ITDefinition.htm

Information technology also defined as the study, design, development, implemention, support or management of computer-based information systems, especially software applications and computer hardware.

http://en.wikipedia.org/wiki/Information_technology