Theres not really much to explain about divs. This is how I look at them, imagine divs/css/xhtml as a giant egg roll. The divs are all the little attributes and defining material inside the egg roll (the div name), once you combine the two and put them into the oven (xhtml) they come out working fine together. I personally thought they defined it pretty well in the Intermediate sections of both css/xHTML, but I guess everyone learns different. You can always check out w3cschools if you can't find it anywhere else...