The term "zone of communications" refers to an area where communication activities such as radio or telephone transmissions take place. The meaning of the word can be changed by using synonyms such as communication sphere, broadcast region, message region, relay area, and networking region. Communication sphere refers to the extent of the communication infrastructure in a particular area. Broadcast region refers to the geographic area where a particular radio or television signal is broadcast. Message region refers to the area where messages are exchanged, while the relay area is an area where signals are picked up and then transmitted to another location. Finally, the networking region refers to the geographical area where networks of communication devices are established.