div and span tags:
The div and span tags are used a lot with style sheets.
The div tag lets you select a block of html to apply a style to. It creates a paragraph break, like the <p> tag
The span tag lets you select a section of html to apply a style to, it is for smaller selections to stylize. It does not create any line breaks it just helps you to isolate and select something for adding style to it. Think of it as a circle or a box that you draw around a section on your page.
They both allow you to apply
a style to a section of html and Dreamweaver will put them in for you.