Definition:
Type of physical system used to carry a
communication signal from one system to another.

Types: Wired&Wireless
 
      Example Of Wired    

             

                                       Twisted-pair Cable                                    Coaxial Cable                                          Fiber-Optic Cable    


                                       
                                                                                                      Example Of Wireless  
                                                    
                                Communication Satellite                                 Broadcast Radio                                        Cellular Radio                                  

            
                                        
                                            Infrared                                              Microwaves                                                       Bluetooth