Connections
The Nintendo Wii uses its built-in broadband adapter to connect to "Nintendo's WiFi Connection" via a wireless Internet connection.
Price
Connecting to Nintendo WiFi is free. However, some services (e,g,. downloadable games) have a one-time cost.
Channels
A "channel" is another term for an application which allows you to do different things from your Wii. Some free channels include weather and voice chat.
Web Browsing
A full (and free) HTML web browser is another channel offered by Nintendo WiFi. You can browse most websites by using the Wii remote to navigate.
Online Play
One of the reasons for connecting a Wii to the Internet is to play select games competitively online. Most games offer this option for free.