To connect to the internet on an Xbox 360 (wired or wireless connection) is free, with this you can connect to other devices on your home network, access an internet browser etc. To play games online or access any other features of "LIVE" like streaming movies or sharing achievements you need to purchase a licence to use it called "Xbox LIVE".
The XBOX Slim will have free wireless.
Use this program: https://sourceforge.net/projects/turnoffxboxcontroller/
A wireless adapter is not included in the standard xbox package.
Xbox Wireless Network Adapter MN740
The Xbox 360 wireless adapter allows you to connect to a wireless router without plugging it in directly. You still need the wireless router, and the router must still be connected to the internet. So no. You cannot get free internet access through a two-inch usb device.
It allows you to connect to xbox live on a wireless network
There is a wireless chip for the Xbox 360 S.
Yes, your xbox can connect with your wireless router. You must buy the wireless add on for the xbox. If you don't wish to pay $100 for the wireless add on, you can just connect an ethernet cable from router into the xbox.
Your router WILL need to be wireless to connect wirelessly to your Xbox, but you can use an ethernet cable if your router is not wireless, straight from the router to the XBOX
Yes You Do
The adapter connects you to Xbox Live but only if you have a wireless network and if you have a Xbox Live subscription.
An xbox