Plugin Or Code To Show Short Description?

Hi guys,

Not sure if there’s a plugin to do this, but I’m looking for something wherein if a user points his/her mouse on a word or phrase, it shows a short description of the word or phrase in question.

If you notice my blog entry below:

https://davezan.com/2006/a-few-dirty-little-secrets-about-backordering-a-domain-name/

The words “Limited Liability Company” is linked to wikipedia’s description of such. Rather than “force” the reader to click the words to see what an LLC is, I was hoping to find a plugin or some lines of code that’ll show some kind of small “sticky note” or something that contains a short description of the underlined (or hopefully highlighted as a better effect) word or phrase.

Any suggestions?