Wireless network refers to any type of computer network that is wireless, and is commonly associated with a telecommunications network whose interconnections between nodes is implemented without the use of wires, such as a computer network (a type of communications network).[1] Wireless telecommunications networks are generally implemented with some type of remote information transmission system that uses electromagnetic waves, such as radio waves, for the carrier and this implementation usually takes place at the physical level or "layer" of the network.[2]

Wireless networking (or Wi-Fi) allows you to network computers and related equipment (print servers, cameras, and other devices that connect by Ethernet) without the need to run wires between equipment.

Advantages:

greater flexibility in equipment location
no need to run network cable throughout your building
ease of moving equipment
easy and clean to add new users (such as at a Wi-Fi enabled "Hot Spot" coffee shop or airport terminal)
Disadvantages:

extra cost
slower speed than wired connections
connections are usually not as reliable
interference from other equipment including cordless phones and microwave ovens
security issues
extra complexity setting up the wireless network
extra power usage in a notebook (usually significantly reducing battery life per charge)
manufacturers usually not releasing open source drivers for Linux or even specs for the wireless chips that would allow developers to write free, high-quality drivers