To achieve this, many different devices, or media, have been developed. Telephone Lines 2. Coaxial Cable 3. Satellite System 5. All of these different methods are in use today, and often they are all used together.
Data often travels through all the different media to get from place to place.
Often, the data being transferred in a communication are of a private or sensitive nature. In most transmissions, data can be intercepted. The different communication media have different strengths regarding their security to interception. These can be easily bugged by listening to the electromagnetic fields surrounding the wires. The contents of the transmission can possibly be determined.