How to specify where a image come from?

Question

How to specify where a image come from in CSS?

Answer 1

Please elaborate your question.
CSS cannot add images ? Unless, you're putting one in the background.
You can add images in HTML using the <img> tag and its url.

Answer 2

HTML
<div id="div">test</div>

CSS
#div {
background-image: url('path-to-image');
}