The various types of communication systems include tactical, duplex, radio, optical and half duplex. These systems enable the passage of messages from one point to another to achieve a given goal.
Each type of communication system uses a medium or group of media to achieve its goals. Optical communication systems use light as the main mode of transmission. A sender creates a message through the use of light signals, after which the recipient decodes its meaning and responds accordingly. Radio communication systems use a transmitter and a receiver equipped with an antenna.
In duplex communication systems, two pieces of equipment are used to pass messages simultaneously. A good example in this category is communication through telephones. Both the caller and receiver are able to pass messages repeatedly.
In half duplex systems, only one person can pass a message, and afterwards, the recipient can respond. The use of walkie talkies is one good example of a half duplex communication system.
Tactical communication systems are normally used in military circles because they are able to adapt to changing situations in the environment.