Bitcoins do not have their own language. They only use the language of electricity. That is why English , Bengali , Arabic are not used in any of these languages. The binary number system is used to communicate these languages to computers. Only 0 (zero) and 1 (one) are used in binary number system. The two digits 0 (zero) and 1 (one) are called binary binary digits . That is, each digit of the binary number system is a bit . Bytes When 8 bits together represent a number , letter or special symbol , it is called a byte. A byte is made up of 8 bits. Computer memory is measured by bytes.