What is information and why we need Information Technology

Information can be defined in different ways:

  • as knowledge obtained from investigation, study, or instruction;
  • as a signal or character (as in a communication system or computer) representing data;
  • as a quantitative measure of the content of information;
  • as data at any stage of processing (input, output, storage, transmission, etc.);
  • as something (such as a message, experimental data, or a picture) that justifies change in a construct (such as a plan or theory) that represents physical or mental experience or another construct. (1)

The last of these definitions serves our purposes best. (Next page)

Limestone Kish tablet from Sumer with pictographic writing; may be the earliest known writing, 3500 BC. Ashmolean Museum. The image by José-Manuel Benito is in public domain