To represent voice and pictures, we could have used a number system to base 3, 4, 5, or even 10, our common everyday decimal number system. Why bother with binary numbers which, as is clearly obvious, are difficult to work with. The reason is quite simple. There are several ways in nature that one can create binary numbers. For example, a switch is open or closed, and a magnet has a north and a south pole. The principal device currently being used is the transistor, which is either on or off. Some uncommon devices are Josephson junctions and light switches. Moreover, circuits made with such 0-1 devices can be analyzed by Boolean algebra. Machines are designed based on binary numbers. For ease of human use these binary numbers are converted to decimal, text, symbols, voice or image so that humans can easily utilize the information.