What is Wi-Fi

A wireless network uses radio waves, just like cell phones, televisions and radios do. In fact, communication across a wireless network is a lot like two-way radio communication. Here's what happens: 1. A computer's wireless adapter translates data into a radio signal and transmits it using an antenna. 2. A wireless router receives the signal and decodes it. The router sends the information to the Internet using a physical, wired Ethernet connection. I think you can use it with both your desktop and laptop.Mostly it is used for laptops. because it is a portable device. When using a laptop with public hotspots, a strong wireless signal is necessary. Laptops with limited range are likely to suffer from slow or dropped Internet connections.

Wi-Fi means Wireless Fidelity.It a Wlan based on 802.11b.So if you install a wireless net card in your desktop computer it can also connect the lan through Wlan.