Information is a sequence of symbols that carries a message, a set of items in which meaning is conveyed, or a specified arrangement of complex structures that conveys a message to a receiver. Information does not exist on its own. It is contained within something and is coded. Information can be coded in different forms, i.e., a written sentence on a piece of paper or on a computer disk. Information has no mass. It can be transferred, conveyed as a picture, sight, sound, an idea, spoken word, mathematical equation, etc. For information to exist, there must be a sender and a receiver. For example, the word “CAT” has no meaning outside a receiver (someone to read it).