Desktop wireless wifi cards enable desktop computers to connect to wi-fi network available in the area. Wifi network provides hight speed internet if available and can share files with in the clients in the network. This kind of network is mostly used in Colleges and Universities, libraries etc. WIfi deskop cards are mostly plugged in Mother board on PCI slot. Some mother board comes with built in wifi connectivity

Laptop / Notebook Wireless Wi-Fi Cards

WiFi cards uses in laptops / notebooks to connect to wireless internet around through Wifi network. Most laptops now comes with built in Wifi enable feature. Old model laptops which do not come along with built in wifi wireless card can plug in wifi PCMCI slot card to connect to hotspot

Wireless Wi-Fi Routers

Wireless WiFi routers is used to connect clients( having WiFi cards ) with server. Wifi router is attached to server and configure with IP address or in some cases just with internet connection. Now this IP helps connect clients to the server for High speed internet and file sharing with server and other clients. Routers are mostly used when server is expected to handle multiple clients at given time.

Wireless Wi-Fi USB Adapters

There is easy solution for Desktop / laptop owners who do not have wifi card already into their systems, they can use USB Wifi drive which connects to USB port on systems and performs as WiFi cards. However USB wifi drive comes with relevently lesser data transfer capability and lesser range.

Handhelds and PDAs

Almost all handsets and PDAs manufactures install Wireless netwok card to their products. PDAs(Personal digital assistance) and other mobile devices scanns WiFi network around, if found can connect to network for Surfing and file sharing.