Quick overview: Like Google, Wofram Alpha works with keywords. However, Wolfram Alpha does a lot more than simply retrieve information from web pages. Instead, it creates a “custom fit” for you by assembling or calculating the information you’re looking for.
Can you give me some examples? If you type in the name of any two cities (i.e – Montreal and Ottawa) you’ll get a rich comparison between the two cities. If you type in the name of a food item (i.e – big mac) you’ll get a detailed breakdown of the nutritional information of that food. Best of all, if you type in a math equation (2x + 15 = 45) you’ll get a visual representation of the equation. You can even download the results or equations as PDF files!
I want to know more! Here is a great organized list of some other possible keyword combinations to try on Wolfram Alpha. In addition, here’s a link that explains how to use some of the more important features on Wolfram Alpha. (Source: Tammy Worcester, ISTE 2011 Philadelphia conference)