WIFI means Wireless Fidelity
You have to order Wi-Fi, I think its a plug. It usually comes with the laptop.
No, that's misunderstanding how wi-fi works. Wi-fi is a signal broadcast from a wireless hotspot, which only have a limited range. To be able to use that hotspot, you have to be within that range,...
Yes, it's built in and works similarly to the wifi on the iPod Touch.
All of the iPod Touches have wifi in them, so you can connect them to wifi.