Use of <div> and <span>

This is a paragraph that's not in the side-bar. This is a paragraph that's not in the side-bar. This is a paragraph that's not in the side-bar. This is a paragraph that's not in the side-bar.This is a paragraph that's not in the side-bar. This is a paragraph that's not in the side-bar. This is a paragraph that's not in the side-bar. This is a paragraph that's not in the side-bar.

So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this. So is this.

sometimes, we say things in latin: caveat emptor