is the entity used to represent a non-breaking space. It is essentially a standard space, the primary difference is a browser will not not break (or wrap) a line of text at the point that this occupies.
You can use the non-breaking space to indent text and images a small amount. It's not a good idea to use a lot in a row, as older browsers don't support more than one at a time.
The Single Pixel GIF Trick
This uses a transparent GIF image that is 1 pixel square. You take that image and stretch it out to force your HTML to lay the way you want it to. For example:
<p><img src="spacer.gif" alt=" " width="1" height="1" style="margin-right: 5px; margin-left: 5px;" />This paragraph is indented 11 pixels.</p>
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