ok, so i've been wondering...what the heck is a div class? i've been looking at various sources, and I always see this tag: <div class="head"></div> somewhere in there. And i see that it makes the text or whatever change. so what is it and how do you define the classes or whatever?

You define class in your style sheet. You can read more about style sheets here: http://www.lissaexplains.com/css.shtml and Class's here: http://www.htmlhelp.com/reference/css/style-html.html#class

Hope that helped,
Tracey

There's honestly no such thing as a div class. A class is a group of styles in a style sheet (see above post for more info on CSS). When a website tells a browser to load a style sheet, the browser makes a note of all the selectors, like classes. Then, when the browser loads the page, it applies the styles accordingly. The class attribute is just a way to tell the browser that "this element should have the style of this class".

So, for example, let's say that in our style sheet we have a class named "potato" which has a red background (classes are denoted with a period in CSS):

.potato {
background-color:red;
}
And in our HTML we say that one of our <div> elements belongs to the class, "potato":
<div class="potato"></div>
That <div> element would then have a red background.