How are 'alt tags' made?

Giganews Newsgroups
Subject: How are 'alt tags' made?
Posted by:  Robert Montgomery (info-blo…
Date: Wed, 26 Mar 2008

How are 'alt tags' made?

I checked in my computerized Dreamweaver guide.

It says, "An image placeholder is a graphic you use until final artwork
is ready to be added to a web page." That's not what I need, because all
of the final artwork is already on my site.

I tried inserting a placeholder next to an existing image on my site,
but the placeholder pushed my existing graphic to the left.