Gool

So, pleease, please bear with me here. I don't really know mcuh about this stuff at all. I was planning on buying a DS lite for my brother next month, and I"m just wondering how online play works on that. Like can he just run a cable from his lite into the usb port and hook up that way? How does the whole wi-fi, wireless thingy work? Please speak to me as if I am a 4-year old regarding this subject as that's about the extent of my understanding at the moment. - thanks kevin