Wolfram|Alpha a search engine?No. It's a computational knowledge engine: it generates output by doing computations from its own internal knowledge base, instead of searching the web and returning links.
Wolfram|Alpha free to use?
Yes, it's free for personal noncommercial use as described in its Terms of Use. Subscriptions will be available in the near future with enhanced features for large-scale and commercial use.
Who is Wolfram|Alpha for?
Everyone! Its goal is to bring expert-level knowledge to everybody.
Where can I see a demo of Wolfram|Alpha?
Watch Stephen Wolfram's screencast, or look at the Examples or Visual Gallery.
http://www95.wolframalpha.com/
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