Wireless Communication:-
Wireless communication is that network which transfer information about two or more people in which those connection are not physically connected to each other, distance may be short such as tv remote ,or as far as thousand of kilometers such as radio communication. examples of wireless communication is two way radio, telephone, mobile phone, such type of wireless communication include the GPS  system for navigation
wireless communication can be via.
Radio frequency communication
micro-wave communication ,e.g long range of sight via highly directional anteenas
infra-red communication via short range communacation
Application of wireless communication:-
Mobile communication:-
                             mobile phones are being using since 1983, mobile phones basically used radio wave to travel along with the desired  reciever. they transmit data through radio wave frequencies and travel long last to the desired reciever. these communication are eventually used by the cell site, beside these networks cellular communication is not possible. 

          These sites used radio mast towers to the high place to keep the cells phones to the cellullar network.transmitter/receivers trancievers,digital signal processor control electronics, a Digital GPS for timing primary and backup electrical power sources, and sheltering.
Wireless data communications are an essential component of mobile computing. The various available technologies differ in local availability, coverage range and performance, and in some circumstances, users must be able to employ multiple connection types and switch between them. To simplify the experience for the user, connection manager software can be used , or a mobile vpn deployed to handle the multiple connections as a secure, single virtual network.
Radio:-

                  Radio is the free timeline of signal through the free space of modulation with frequencies of electromagnetic waves information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude,frequency, phase or pulse width. When radio waves pass through an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.