Use when dealing with an acronym in a webpage. NOTE: Most HTML coders use the abbr tag.
<p>This is a <acronym title="Light Amplification By Stimulated Emission of Radiation"> laser</acronym>, it is used a lot in Medicine these days</p>
Use this when you want the meaning of the acronym to be displayed when the mouse hvrs over the word.
A link to a page with more info, then the name of the site the info came from (i.e. W3Schools).