Wireless Ethernet - how is it possible?

A wireless LAN, as the name implies, is a LAN without any wires to connect different nodes in the network, because in these LAN's wireless media or unguided media is used for this purpose.
Most wireless LAN's today work either on InfraRed (IR) or Radio Frequencies (RF). InfraRed devices have a problem of "line of sight" , while radio frequencies are more immune to noise etc.
Just like any network a wireless LAN also has to follow a standard , some protocol , some handshaking mechanism. The standards for Wireless LAN's which are most commonly used are 802.11 by IEEE and Hip...