A wireless network is simply two or more computers linked together by radio waves for the sake of transferring data or sharing resources. Wireless networking is an excellent solution where you don't want to deal with cables and it takes little effort to expand.
There are two kinds of wireless networks:
Ad-hoc :
in Adhoc mode each device in the network with a wireless adapter can communicate directly with each other without the use of a router or access point or central device . You can share data files, internet and printers etc with this method. However, it is more difficult to connect to networks - both wired and wireless. This mode is also known as peer-to-peer networking.
Infrastructure :
Each computer in the network uses a router or access point or third device to handle all data transfer like files , printer and network traffic. You can easily access a wired network, whether it is a LAN or the Internet. For most home or small business networking purposes, infrastructure mode is the best choice. 
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