scope:

Communication today is digital and therefore sound, pictures, voice, data carried by networks are data expressed in terms of bit, bytes and their multiples (kilo (k), mega (M), giga (G), tera (T)). A bit (binary digit) is the smallest digital unit and has only two values: 0 or 1. A byte includes 8 bits and defines the size of a data file. Transmission capacity of networks and terminals is not expressed by using bytes, but using bit per second (Bit/s). When a data file is transferred in a network two supplementary bits are necessary. It means that 10 bits are required for 1 byte.