Information Technology (IT) is revolutionizing the way in which we live, work, study, learn, play, and do business. The digital revolution has given mankind the ability to treat information with mathematical precision, to transmit it at very high accuracy and to manipulate it at will. Computers and communications are becoming integral parts of our lives. A few decades back communications used to be between people. But now inanimate objects are getting into the act—books can tell the cash registers how much they cost; identity cards can tell the door lock whether to open or not; automated guided vehicles can tell the host computer where they are in the shop floor, what they are carrying, and when they will be free; missiles can compare the landscape with their own map and hit the target with pin-point precision; on the Internet people engage in lively chats, discussions, and play games even if they are physically in different continents.