Binary number system is a counting system in machines. All digital systems use binary system for manipulation of numbers. For instance, binary value is letter “A” to represent on digital systems. It is called ASCII code. Numbers in base 2 are called bits, 0 bit and 1 bit. A group of 8 bits is called a byte.1024 bytes make up 1 kilobyte, 1 KB. 1000 KB make up 1 MB, megabyte.